The Monsoon Is Coming — Is Your Plant Collection Ready?
For plant lovers across India, the monsoon season is a time of mixed emotions. On one hand, the lush humidity and cooler temperatures are a dream for tropical plants. On the other hand, heavy rains, waterlogged soil, fungal diseases, and pest explosions can wreak havoc on even the most carefully tended collection.
The good news? With a little preparation and the right care adjustments, your plants can not only survive the monsoon — they can absolutely thrive in it. At GROMEE, we grow tropical and ornamental plants right here in Thrissur, Kerala, where the monsoon is intense and long. Here's everything we've learned about keeping plants healthy through the rainy season.
Why Monsoon Is Both a Blessing and a Challenge
India's southwest monsoon (June–September) brings the following conditions that directly affect your plants:
- High humidity (80–95%): Wonderful for tropical plants that crave moisture in the air, but also a breeding ground for fungal diseases
- Reduced sunlight: Overcast skies mean less light for photosynthesis, slowing growth
- Heavy rainfall: Can waterlog outdoor and balcony pots, causing root rot
- Cooler temperatures: Generally beneficial, but sudden drops can stress some tropical varieties
- Pest surges: Fungus gnats, slugs, and certain other pests thrive in wet conditions
The key to monsoon success is adjusting your care routine to work with these conditions rather than against them.
The Most Important Monsoon Rule: Reduce Watering
This is the single most impactful change you can make. During the monsoon, the high ambient humidity means your plants lose far less moisture through their leaves, and outdoor plants may be getting all the water they need from rainfall alone.
General monsoon watering guidelines:
- Check soil moisture before every watering — stick your finger 3–4 cm into the soil. If it's still moist, wait.
- For indoor plants, reduce watering frequency by 40–50% compared to summer
- For balcony and outdoor plants, let rainfall do the work and only supplement if the soil dries out
- Always empty saucers and trays after rain to prevent roots from sitting in standing water
Overwatering during the monsoon is the number one cause of plant loss in India. When in doubt, underwater rather than overwater.
Protect Against Fungal Disease
High humidity combined with poor air circulation creates the perfect conditions for fungal diseases like root rot, leaf spot, and powdery mildew. Prevention is far easier than treatment.
Preventive measures:
- Improve air circulation: Space your plants out so air can move freely between them. Avoid clustering plants too tightly during the monsoon.
- Neem oil spray: Apply a diluted neem oil solution (5 ml neem oil + 1 ml liquid soap per litre of water) to leaves every 2 weeks as a preventive fungicide and pesticide
- Remove dead leaves promptly: Fallen or dying leaves on the soil surface harbour fungal spores. Remove them immediately.
- Avoid wetting leaves when watering: Water at the base of the plant, not overhead
- Check your soil mix: If your potting mix is heavy and retains too much water, consider repotting into a chunkier, better-draining mix before the monsoon hits
For your rare Philodendrons, Alocasias, and Anthuriums — which all prefer excellent drainage — this is especially important. Review our care guides for Philodendrons, Alocasias, and Anthuriums for specific soil mix recommendations.
Managing Light During the Monsoon
Overcast monsoon skies can reduce light levels significantly — sometimes by 50–70% compared to clear summer days. For light-hungry plants, this can slow growth and cause etiolation (stretching towards light).
Tips for managing low light:
- Move plants closer to windows to maximise available natural light
- Clean dusty windows — even a thin layer of dust significantly reduces light transmission
- Consider supplementing with a grow light for 4–6 hours daily during extended overcast periods
- Avoid fertilising heavily during low-light periods — plants can't use nutrients efficiently without adequate light
Balcony Plants: Special Monsoon Considerations
Balcony plants face the most intense monsoon challenges. Heavy rain can batter delicate leaves, fill pots to overflowing, and create waterlogged conditions very quickly.
- Move sensitive plants under cover during heavy downpours — a covered section of the balcony or just inside the door works well
- Elevate pots on pot feet or bricks to ensure water drains freely from the bottom
- Check drainage holes are clear and not blocked by roots or debris
- Secure tall plants against monsoon winds with stakes or by moving them to sheltered spots
Browse our Balcony Collection for plants that are well-suited to outdoor conditions, including the monsoon season.
Watch Out for These Monsoon Pests
Fungus gnats: These tiny flies lay eggs in moist soil. Let the top layer of soil dry out between waterings to break their breeding cycle. Yellow sticky traps are effective for catching adults.
Slugs and snails: They love wet conditions and will munch through soft leaves overnight. Check plants in the evening and remove manually, or use diatomaceous earth around pot bases as a barrier.
Mealybugs: Surprisingly common during the monsoon, often hiding in leaf axils and new growth. Treat with a cotton swab dipped in rubbing alcohol or a neem oil spray.
Root rot pathogens: Not a pest per se, but Pythium and Phytophthora fungi thrive in wet conditions. If you notice sudden wilting despite moist soil, check the roots immediately — healthy roots are white and firm, while rotted roots are brown and mushy.
Fertilising During the Monsoon
Reduce fertilising during the monsoon. With lower light levels slowing photosynthesis, plants can't process nutrients as efficiently, and excess fertiliser salts can build up in the soil. Switch to a diluted feed (quarter strength) once a month rather than your regular schedule, and resume normal feeding when the skies clear in October.
Embrace the Season
The monsoon, for all its challenges, is also a time of incredible growth for tropical plants. The humidity, the cooler temperatures, the fresh air — these are the conditions our plants evolved in. With the right adjustments, you'll find your collection emerges from the rainy season lusher, greener, and more vibrant than ever.
From all of us at GROMEE — happy monsoon growing! ☔️🌿