The northeast monsoon is the main rainy season for Puducherry and coastal Tamil Nadu. After a long, hot summer, the rain is welcome – but cloudy days, wet soil and warm, humid air also bring fungus, rot and a wave of small pests. Here is a simple checklist to spot problems early and keep your potted plants healthy through October, November and December.
Why plant problems increase in the monsoon
Most monsoon trouble comes from three things: soil that stays wet for days, leaves that never fully dry, and less sunlight. Roots need air as well as water, so pots that hold water after every shower slowly suffocate the roots. Wet leaves in still, humid air are where fungal spots begin. Weak, stressed plants then attract sap-sucking insects. Fix the growing conditions first and you prevent most of the damage.
Common problems to look for
1. Root and stem rot
Signs: yellowing lower leaves, a soft or black base of the stem, soil that smells sour, and a plant that wilts even though the soil is wet. Succulents, cactus, adenium and snake plants are the most at risk. Stop watering, move the pot under shelter, and check that the drainage holes are not blocked. If the stem base is mushy, cut away the soft part and let the plant dry before replanting in fresh, fast-draining mix.
2. Leaf spots and fungal patches
Signs: brown or black spots with a yellow ring, powdery white patches, or leaves that turn black at the edges. Remove badly affected leaves and throw them away (do not leave them in the pot). Space your pots so air can move between them, and water at the base of the plant in the morning rather than over the leaves in the evening.
3. Mealybugs and aphids
Signs: white cottony clusters on stems and under leaves, sticky leaves, or tiny green or black insects on new shoots. Hibiscus, guava, citrus and many indoor plants get them often. Wipe or wash them off with water, prune heavily infested tips, and repeat checks every few days. Many home gardeners also use a mild neem-oil and soap spray – always test it on a few leaves first and spray in the evening, not under strong sun.
4. Snails and slugs
Signs: holes in soft leaves and seedlings, and shiny trails in the morning. They hide under pots and in damp corners. Pick them off in the early morning or after dark, and keep pots raised off wet floors.
5. Fungus gnats
Signs: tiny black flies around the soil surface of indoor pots. They breed in soil that stays constantly moist. Let the top layer of soil dry before watering again – this alone usually solves the problem.
Prevention: get the pot and soil right
- Use pots with good drainage holes. Plastic grower pots with several holes at the base let excess rainwater out quickly. Our grower pots and 8 inch nursery pots are made for this.
- Lift pots off the ground. A few bricks or a stand stops pots sitting in puddles on balconies and terraces.
- Use a light, airy mix. Heavy garden soil stays waterlogged. Mixing red soil with cocopeat and some compost gives better drainage and air. See our soil and growing mixes, including cocopeat and red soil.
- Empty saucers after rain. Standing water under a pot keeps the bottom of the root ball wet.
- Water by touch, not by habit. Push a finger 2–3 cm into the soil. If it is still damp, skip watering – during rainy weeks many plants need very little extra water.
A simple weekly monsoon routine
- Walk around your plants once a week and turn a few leaves over to check the undersides.
- Remove yellow, spotted or fallen leaves from pots and the floor.
- Check that drainage holes are clear and saucers are empty.
- Move succulents, cactus and adenium under a roof edge during continuous heavy rain.
- Hold off on heavy fertiliser during long cloudy spells; feed lightly once the sun returns and plants show new growth.
When to repot
If a plant keeps rotting because its pot has no holes or the soil has turned into a solid, soggy lump, repot it into a slightly larger pot with fresh, well-draining mix on a dry day. Water lightly afterwards and keep it in bright shade for a few days while it settles.
With good drainage, airflow and a quick weekly check, your plants can come through the northeast monsoon strong and ready to grow in the cooler months. Need pots, soil or new plants for the season? Shop online at Dream Nursery – grown and made in Perambai, Puducherry, with delivery across India.