In the Western Ghats, the spread of non-native plant species is rapidly replacing native vegetation, causing significant ecological imbalance. This invasion is leading to a food crisis as these plants disrupt the natural habitats of key prey species. As a result, wildlife is forced to enter human settlements in search of food, increasing conflicts between animals and communities.

Western Ghats, pc: Parnavi Bangar

Invasive species like Lantana, African Tulips, and Morning Glory are widespread, causing notable damage to our ecosystems. These aggressive plants are not native to India and are displacing traditional fruit-bearing trees such as mangoes, wild jack, wild berries, and other native plants in various forests. Their rapid growth makes them difficult to control, posing a threat to the health of our forests.

Tall Morning Glory

Source: Guests who never left

The Tall Morning Glory also known as Kaladana is a fast-growing vine that can reach 2-3 meters in length, with slender, hairy stems and heart-shaped leaves. Its vibrant blue, purple, or pink flowers are funnel-shaped, and it produces up to 25,000 seeds per plant, which can spread by wind, rain, or accidental human activity.

Kaladana grows by twining around other plants, creating a thick canopy that shades and competes with them for nutrients and water. This makes it a troublesome weed, as it can significantly reduce crop yields. It can also spread rapidly in both disturbed areas and forests, making it a challenge to manage.

Young seedlings can be easily pulled out by hand. For small patches, cutting the plant is an option, but make sure to dig out the roots to prevent it from growing back. In areas where the vine forms large patches, cutting followed by herbicide application is recommended to stop regrowth.

African Tulip

Source: Guests who never left

The African Tulip, also known as Pichkari and Rugtoora is a medium-to-large tree that can grow up to 35 metres tall, with a wide crown and smooth, greyish-brown bark. It has deep green, glossy leaves and produces striking orange-scarlet flowers, with its seeds dispersed by wind.

Pichkari trees invade open pastures, abandoned agricultural land, plantations, and disturbed forests. They grow rapidly, forming dense stands that suppress other vegetation. The flower nectar is toxic to insects, while mammals like Nilgiri langur and barking deer eat the flowers, and parakeets and squirrels consume the seeds.

To manage African tulip trees, young trees can be uprooted, though large trees may resprout from root fragments. Chemical control includes injecting herbicide into young tree trunks or applying it to stumps of cut trees. In some areas, biological control using pathogenic fungi has been effective for young trees.

Lantana

Source: Guests who never left

Lantana, or Raimuniya and Tantani, is a woody shrub that grows 2-5 metres tall. It thrives in both dry and wet environments, forming dense thickets or climbing trees. Found across India, including Goa, its leaves are rough, oval, and green with toothed edges. The small, colourful flowers attract butterflies, and its fruit turns from green to black, dispersed by birds and mammals.

Lantana's dense growth prevents native plants from growing and changes forest structure. It increases fire risks and is toxic to livestock, reducing available forage. Lantana also hosts diseases like sandal spike disease and suppresses important plants like amla, posing risks to forest communities.

The most effective removal method is cutting the plant below the root collar to prevent regrowth. Uprooting is less effective and labour-intensive. Consistent removal and establishing canopy cover can help control Lantana.

Conclusion:

There are many such invasive plant species altering habitats in our forests. Managing them in the forests of the Western Ghats is crucial for preserving biodiversity and ecological balance. Raising awareness about such species and promoting knowledge about native trees is essential for safeguarding our environment. 

This understanding is particularly valuable for individuals managing their gardens, such as in Goa, where knowing about trees in Goa is crucial for effective plant management. For further information on such species refer the book ‘Guests who never left’ and the article ‘No food in Forests’ for Invasive species in the Western Ghats. For more tips on living in Goa and managing your home and garden, stay tuned to our blog!

Goa is a goldmine of biodiversity and trees are the crucial negotiators that tie these ecosystems together. As awareness increases about habitat loss and deforestation, people have taken the responsibility of hosting planting and re-wilding drives. The first step in this process is to identify and select plant species which are most effective and resource efficient for natural landscaping.

Here are popular, easy to source, and easy to plant species that are commonly found along Goa’s roads and within Goan homes.

AVENUE TREES

These trees are typically used for roadside planting owing to their large and extensive canopies that offer shade throughout the year. One often finds seasonal flowering trees chosen as avenue trees. However, fruiting varieties are typically avoided and are found mostly in private properties.

01 The Indian Laburnum

Cassia Fistula or The Indian Laburnum or Amaltas as it is locally called is a medium-sized deciduous tree. It is a sun loving tree that is known for its abundant and glorious yellow summer flowers. The tree is extensively found in Goa, especially along the roads of Panjim.

02 The Scholar’s Tree

The Scholar’s Tree or Satvin as it is locally called is a tall, evergreen tree with branches in whorls. The tree blooms in the winter with white, fragrant flowers that are found in clusters. The tree is found all over Goa and is also otherwise known as The Devil’s Tree.

HOME TREES

Goa’s incredible biodiversity is best experienced at home. Homeowners can choose to plant any native flowering or fruiting tree without worrying about extensive care or maintenance. Many of these trees are also found in Goa’s public gardens and are known to attract a wide variety of birds and butterflies. These trees also support a lot of insects and creepy crawlies. This post tells you how you can design to coexist with and celebrate Goa’s diverse flora and fauna.

03. The Frangipani Tree

Plumeria Rubra or Plumeria Obtusa or Frangipani or Champa as it is lovingly called is a tropical tree and is a residential favourite in Goa. The Champa shrub has a lovely sculptural form and requires little maintenance. The plant does not require too much water and can thrive in any well-drained soil. The flowers are fragrant, bloom throughout the year, and come in different colours.

04. The Traveller’s Palm

The Traveller’s Palm is a picturesque spreading tree that looks beautiful when used along compound walls and the site edges. The fan profile layers over and blurs the hard site edge while also creating privacy. The palm is water loving and retentive, making it a valuable landscape feature during Goa’s heavy monsoons.

Also read about the native trees of Goa here.

Find a detailed list of Goa’s native trees in this directory.

Read our blog post on Protecting the Western Ghats here.

Goa is a goldmine of biodiversity and native forests are the crucial negotiators that tie these ecosystems together. As awareness increases about habitat loss and deforestation, people have taken the responsibility of hosting planting and re-wilding drives. The first step in this process is to identify and select native plant species which are most effective and resource efficient for natural landscaping. Native trees offer huge short term and long term benefits:

• Native trees are well-adapted to the local climate, which means they will have the best chance at survival.

• Native trees prevent population decline of the local wildlife as the animals are not forced to shift into unfamiliar habitats.

• While non-native trees might not do well up against local pests, native trees often don’t have as many pest problems because they develop symbiotic relationships with other local species.

Here are 4 popular, easy to source, and easy to plant native species of Goa:

Terminalia Elliptica or The ‘Indian Laurel’ is the State tree of Goa. A few other names of this tree are Mati, Asna, Saj, or Crocodile Bark Tree.

Terminalia bellirica is a deciduous tree that grows upto 35 m in height. It is a sun loving tree that thrives in slightly moist soils. The fruit of the tree is often celebrated for its medicinal properties.

Pterocarpus marsupium, also known as Asann and Malabar kino is a deciduous tree that can grow up to 30 m (98 ft) tall. It is native to India, Nepal and Sri Lanka. The beautiful yellow flowered tree however is currently on the list of threatened species due to dwindling numbers and needs to be revived.

Holoptelea integrifolia, also called The Indian Elm is a deciduous tree that grows upto 25m in height. It is often sourced for timber which makes cheap furniture and also used as firewood in rural parts. Its flowers, leaves and bark have medicinal uses.

Apart from this Goa has several indigenous fruit trees including jack fruit, tamarind, guava, pineapple, and kokum. While these are not advisable for highways, they are wonderfully suited for smaller city avenues, parks, city campuses, and most importantly individual residential plots.

A detailed list of Goa’s native trees can be found in this directory. These trees support a lot of insects and creepy crawlies. This post tells you how you can design to coexist with and celebrate Goa’s biodiversity.

Goa is listed among the 36 most important biodiversity hotspots in the worls. To know more about the ecological significance of this belt, you can read our blogpost on Protecting the Western Ghats here.

In this session, we speak to Shubhendu Sharma, Founder of Afforestt. Afforestt does amazing work rewilding barren land in rural as well as urban areas, in different climatic zones, using different species through a process called the Miyawaki Method. Over the conversation, we discuss the fundamentals of the Miyawaki technique, the how tos of growing a forest, the benefits of picking native species, the ways and means of making forests and landscapes in the cities, as well as the challenges of growing and maintaining a dense forest. We also delve into the subject of mono-planting and understand how it impacts local biodiversity.

Here are some key takeaways from the session:

• Above ground, we perceive the forest as multiple trees, plants, and shrubs. But below ground, the forest grows as a single organism. ‘The Hidden Life of Trees’ by Peter Wohlleben is a great read to understand how trees grow and communicate

• ‘Jungle Trees of Central India’ by Pradip Krishen is an excellent resource to learn about Indian native trees.

• One can visit the following native forests in India to find clues about and study the local indigenous species:

  • Sanjay Gandhi National Park in Mumbai

  • Kabini Forest in Bangalore

  • Srisailam Reserve in Hyderabad

  • Annamalai Forest in Tamil Nadu

  • Ridge Forest of the Aravalli Range in Delhi

  • Alwar Forest in Gurgaon and Haryana

  • Kanha and Tadoba National Parks in Central India

  • Jhilli Milli Forest in Kolkata

  • Jhalana Forest in Jaipur

  • Bathinda Forest in Punjab

  • Nepli Forest in Chandigarh

• Afforestt also has an open source DIY toolkit on How To Build Forests. You can find the methodology here.

Read more about growing urban forests using the Miyawaki method in our introductory blogpost.

In this IG Live, I speak to Dr Pallavi Latkar, the technical brains behind the ecological site planning at our project, The House with Three Pavilions . Pallavi is an ecological expert, she is the Founder and Director at GRASSROOTS Research & Consultancy in Mumbai. Over the Live session, Pallavi and I discuss the extensive rain water harvesting system we have created at The House with Three Pavilions. For this site with many contours and topographical variations in Goa, this monsoon ready water management has been a great way of rainwater harvesting and distribution to recharge the underground water table. Over the course of our conversation, we get into the details behind the site planning and construction, discussing the key techniques we have employed. We also speak about the benefits of conserving natural water systems and debunk myths around the maintenance of these systems.

Here are some additional takeaways from the session:

• Every site has a story to tell - the story of its soil, water, and vegetation. Listen to the story - smell, see, touch and feel its elements.

• Our sights have many hidden clues in plain sight - within the trees, plants,and shrubbery. FOr example:

  • A Mango Tree with a dense canopy tells us the site has a good water table.

  • The presence of wild Colocassia indicates the spot where water will stand and collect in the monsoons.

  • Moringa and Neem Trees are native trees that are most beloved by birds.

  • ‘Shankasur’ or Cesalphinia is a favourite haven for bulbuls.

  • Fish-tail Palms will attract Barbets, Coppersmiths, and Hornbills.

• Young architects who do not have access to an environmental consultant can start off by using free and universal tools such as:.

  • Google Earth Imagery from which contour levels of the site can be approximately extracted. 

  • Toposheets of India can be found online - it may require some searching on websites of Landscape Universities worldwide. 

  • Rainfall data and history are available online at various sites including The Meteorological Department website to ascertain the precipitation on your site.

  • The website of The Irrigation Department of India which gives the specifics about soil in every region. 

  • Software like Google SketchUp, Revit and Grasshopper which allow you to geo-locate and model the site and surroundings in 3D which will help you visualize the terrain.  

In this IG Live, I delve into the factors involved in taking A Site Positive Approach. I speak about how design can contribute to the land it stands on as well as simple measures that can be taken to ensure the site is preserved and that resources are managed well during and after construction. Over the Live, I explain the importance of the water management systems at our houses in Goa, and the natural systems we have implemented such as a pond and bioswales. I also answer questions about site positivity in the rural and urban contexts, speak about the opportunities offered by certain materials and the feasibility of creating a positive impact. Tune in to watch the entire session.

To know more about taking a site positive approach, you can read our blogpost on the subject which looks at the strategies implemented at The House With Three Pavilions.

Geoffrey Bawa is an unforgettable and continuous inspiration to most architects. There is an intangible relationship with nature that is so beautifully established. To see our inspiration translate into our work - in design, in spatial character, in connection and reverence towards nature - finding new meaning in every site we build on, feels wonderful and magical.

As we look back on our projects, it feels great to see many of our spaces carrying the sensibilities and sensitivites that Bawa inspired throughout his practice. The following set of images puts our project photos alongside some expertly crafted spaces byt the tropical wizard. It is our ode to the master architect, a reflection of the small but diverse ways in which he has touched our design thinking and building values.

The Balcao Connection

The interesting architectural connection between Goa and Sri Lanka is visibly articulated in elements such as inbuilt seats. The first picture is a site picture of a porch at our project, The House With Three Pavilions. The Goan Balcaos face each other, framing the entrance to the home pavilion. The second photograph is from Bawa's Lunuganga garden, with the in built seats looking out into the surrounding greenscape.

Windows for trees.

There is always time to frame a view. Vistas of green, however small bring a sense of freshness and colour into any space. The first picture is from our project Navovado, as the building volume is punctuated by foliage and fenestration. The second photograph is from Bawa's Garden, the bark of a tree framed through the small verandah window.

Seats built in to live with nature⠀

The first picture is of an insitu seat built next to the champa tree, watching the coconut plantations beyond on site at The House With Three Pavilions. The second photograph is from Bawa's estate, with an in built seat, finished with a wooden railing back, set in the enclosed gazebo to immerse oneself into the sights and sounds of nature around.⠀

A Hidden Pool⠀

The first picture is of a terrace pool overlooking the trees and the hills at our project Nivim. The second photograph is from Geoffrey Bawa's House for Dr Bartholomeusz, with the pool quietly tucked into the indoor-outdoor courtyard.

Finding Bawa ~ The Stairway Composition⠀
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The first two pictures are from our project Navovado, looking at the stairway as it adds sculptural value and the play of different levels to one end of the living room. The second photograph is from Bawa's Bentota house, looking at his minimal, yet artistic stairway composition.⠀

Read Part I of Finding Bawa here.

Geoffrey Bawa is an unforgettable and continuous inspiration to most architects. There is an intangible relationship with nature that is so beautifully established. To see our inspiration translate into our work - in design, in spatial character, in connection and reverence towards nature - finding new meaning in every site we build on, feels wonderful and magical.

As we look back on our projects, it feels great to see many of our spaces carrying the sensibilities and sensitivites that Bawa inspired throughout his practice. The following set of images puts our project photos alongside some expertly crafted spaces by the tropical wizard. It is our ode to the master architect, a reflection of the small but diverse ways in which he has touched our design thinking and building values.

Building with nature

Watching these two pictures side by side leaves us with a sense of achievement and happiness. The first picture is from our project, The House with Three Pavilions in Goa. The second picture is from Ena De Silva's house, built by the master Geoffrey Bawa.

Verandahs celebrating the trees of the land
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The first picture is from our project Navovado, looking at the old mango tree preserved during construction on site for this vacation house in Goa. The second photograph is from Bawa's Lunuganga estate, framing the magnificent tree by the lake.⠀⠀

Making greenery part of the building elevation
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The first picture is from our project Navovado, as boundaries are blurred between the house and its landscape. The second photograph is from Bawa's Lunuganga country estate, picturing the house among the greenery perceived from the lawn.

A Place in The Shade⠀
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The first picture is from our project The House With Three Pavilions, as the semi open corridor faces the internal courtyard on one side, touching it with an in situ seat and transitioning into different rooms on the other sides, each celebrating different views. The second photograph is from Bawa's estate, as the corridor behaves like a verandah even as it connects the indoor spaces from side to side. ⠀

A Welcoming Wilderness⠀
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The first picture frames the entrance to a pavilion at The House With Three Pavilions, brought alive with the growth of native plant species. The second photograph is from Bawa's Lunuganga garden, with the entrance pathway bordered by the lush wildscape on one side. ⠀

Read Part II of Finding Bawa here.

How does one build in a rural location with the objective to have minimal or zero-impact on the environment?

This question is the primary driver behind the site planning strategy for The House with Three Pavilions located in Goa, India.

The project site is located on the edge of rice paddy fields with a dense cluster of local forest trees on one side and a coconut grove in the middle. The following diagram illustrates some of the critical measures taken as part of the site planning strategy.

WHY IS AN ECOLOGICAL RESPONSE ADOPTED?

• As Goa gentrifies, rampant new construction threatens to rock the delicate balance between nature and man. This project is our attempt to showcase that the built form can tread lightly on the land with conscious design and measured planning. 

• The design focus is to leave a minimal or zero-impact on the functioning natural ecological cycles at the site that pre-date the new construction. 

• The site is geographically located along the path of the watershed from surrounding higher elevations that finally drains into the Arabian Sea. The design planning is oriented to support and improve the water movement through a comprehensive water management plan.

• The water management plan is implemented to address three primary concerns around the site - to recharge the depleted underground water table, to increase water availability for the paddy fields bordering the site, and to reduce the water load on the Municipal Draining system.

WHAT HAS BEEN DONE?

• During the survey, a natural depression was found at the center of the site with a perennial wetland hosting diverse flora and fauna. This existing depression was dug out (until the underground water level in the driest month) and integrated with the existing well on the site. Today, this natural wetland feature is preserved and developed into a seasonal waterbody which also forms the focal point for the landscape created using a native planting strategy.

• All the roof rain water runoff is captured and along with the site surface runoff, it is directed into the central seasonal pond for rain water harvesting. The edges of the pond were formalized with mortar-less retaining walls built in local laterite rubble. This was done to reduce the erosion of the pond edges and to retain the water as a permanent feature in the landscape

• The pond was further connected to a newly planned system of bioswales that spread the collected runoff water over a larger site surface area increasing the rate and extent of percolation on the site. This keeps the level of our underground water table high throughout the year and the soil moist, reducing the garden irrigation requirement in the dry season.

• The bioswales use no cement in their construction and can absorb water through the walls and the base. The construction of the bioswales and the pond without cement, also allows for the water to remain clean without any toxicity of the cement leaching into the landscape.

HOW DOES THIS CREATE A POSITIVE IMPACT?

• The water management was a critical part of this project and offsets the load on the rudimentary public storm water systems found in the Goan villages especially during the heavy monsoons.

• As a result of our efforts, the underground water levels have been improved hence negating the impact of the house construction on the environment. We have been able to prevent any additional flooding at the neighboring fields or any other low-lying area in the village. 

• The project also prioritises the enhancement of the site’s resources and biodiversity. In doing so, it also creates a positive impact on its surroundings by protecting the agrarian viability which is constantly threatened by new construction and increased human activity. Our success can be measured by the number of birds, reptiles, butterflies and insects that can be found on the site today. We have uncovered peacock eggs, cuckoo eggs and baby parrots on our site. It is a win to see that the animals continue to find the site a safe space even as they come in close contact with the human life around, making this truly a space for all seasons and species.

(Water Management Plan in consultation with Pallavi Latkar and team at Grassroots Research Mumbai.)

CREEPY CRAWLIES!!! 
Try as you might, you can’t keep these beauties out of your lives and homes in Goa! The idea is to co-exist with them. Simple mosquito screens in doors and windows go a long way in keeping them out of your immediate space. Our efforts of sustainability in our architecture and construction is an effort to preserve the beautiful biodiversity flourishing on the sites we built on while we can live in harmony with them. 

Living in Goa is all about looking closely and admiring the lovely colors and patterns that only nature can create. 

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