Smart Ways To Stop

Potted Herb

Garden Wilting In October Heat

How each herb feels the heat is worth knowing for anyone who owns a potted herb garden. These herbs fall into three groups. Basil, mint and coriander fall under the more vulnerable group, as these herbs need the most active protection. Next is the more naturally heat-tolerant group, where rosemary and thyme fall. These herbs still need water management, but with less drama. Finally, curry leaf and lemongrass fall under a third group, which tolerates heat but needs regular water. However, this guide shares some overall tips that can protect your potted herbs from wilting in the harsh October heat.

If you are buying new pots for a hot spot, go pale. Dark colours absorb a higher percentage of the sun's radiation and run hot. On the other hand, light or white pots reflect much more of it and stay noticeably cooler. Unglazed terracotta cools itself through evaporation (moisture wicks through the porous walls, carrying heat away with it), but that same porosity means it dries out 25–40% faster than glazed ceramic or plastic. So make sure the material of the pot is of genuine quality.

A small effort of getting pots off hot, hard surfaces can really pay off. In your herb garden, always raise pots on pot feet, wooden blocks or even old broken terracotta shards. It is the biggest step, as it creates an insulating air gap underneath. Avoid placing your pots directly on concrete, tile and stone, especially if you are growing coriander at home. These surfaces absorb daytime heat and radiate it back up into the pots for hours after sunset, which can cause sensitive herbs to wilt.

Watering your herb garden in the early morning is better, as it helps your herbs prepare for the long hours of bright sun ahead. Add a lighter evening watering in a genuine heatwave, especially for thirsty herbs like basil and mint. This replaces what the day took out, while there is still time for the roots to take it up before night. Go easier on rosemary and thyme here, as they are much more at risk from soggy roots than from heat itself.

Always use shade cloth on the worst days or when there is a high risk of the herbs drying out or getting damaged. Proper shade cloth can drop the temperature underneath by up to about 5.5 degrees Celsius compared with open sun. You can use a simple DIY shade net made from old cloth, green netting or even a large enough dupatta. Just hang it on wires right above your plants, like we used to while playing house as children.

Mulching is the best potted herb garden care for many reasons. It helps suppress weeds around your herbs and is also one of the easiest ways to protect your herb garden from heat. Moreover, it keeps the soil cool and prevents water from evaporating too quickly. Use wood chips, nut (pecan) shells, husk and pine straw as mulch. Spread a thin layer of the mulch of your choice on top of the soil to retain moisture and reduce the need for frequent watering.

When it is hot, be careful with fertiliser because it stresses the plants further by forcing more growth. Use a weak liquid fertiliser like seaweed extract or compost tea, and do it once every two to three weeks. Remember to water the soil before feeding to prevent root burn. Plants that grow quickly, like basil and mint, are the best candidates for feeding. Rosemary and thyme require almost no fertiliser, because it weakens their aromatic leaves.

Regular harvesting ensures that the herbs remain lush and prolific. Regular cutting also prevents the plants from becoming leggy. It is best to harvest in the mornings because the leaves contain the most moisture at that time, and make sure you never cut more than one-third of the whole plant. For basil and mint, pinch the top part of the plant, just above two leaves, and pluck the flower buds while they are still forming to ensure that the leaves continue to grow.