Rain after a drought
It is autumn. Thank goodness we have received a substantial amount of rain in the past week.
Rain after a drought brings rapid growth but also brings risks, including soil erosion, root rot and sudden plant collapse due to waterlogging.
Manage the transition by checking drainage, reducing automatic irrigation, managing weeds and monitoring for fungal diseases. Plants may need time to recover and nutrients may be leached.
Key Actions for Post-Drought Rain:
• Prevent waterlogging: Ensure soil drains properly, especially for potted plants. If soil remains waterlogged for over one to two days, take steps to improve drainage.
• Adjust watering: Turn off automatic irrigation systems during and immediately after heavy rain.
• Remove excess water: Empty saucers, buckets and containers to prevent drowning roots and controlling mosquitoes.
• Manage weeds: Weed surges are common. Remove them early as they grow faster than desired plants after rain.
• Prune and support: Prune damaged, dead or diseased parts of plants immediately. Stake plants that may have become top-heavy due to rapid growth or water weight.
• Nutrient boost: Heavy rain can leach nutrients. If plants appear yellow, consider applying a balanced, gentle fertilizer once the soil has dried out.
• Check for Disease: Increased moisture can trigger fungal diseases, particularly on vegetables like tomatoes and cucumbers. Mushrooms also appear in abundance three to five days after rain because the moisture triggers underground mycelium to produce fruiting bodies. These fungi thrive in damp conditions, breaking down organic matter in soil or mulch and are often seen in lawns and forests during autumn. While many are beneficial, some appearing after rain are toxic so identification is essential.
Potential Risks:
• Plant collapse: Plants under severe stress may not cope with sudden, excessive water.
• Fruit splitting: Heavy rain can cause fruit to swell too rapidly and split.
• Root rot: Soil compaction from heavy rain limits oxygen leading to root rot.
For long-term protection, build soil health to improve water retention and drainage.
