Gardener's guide: Common mistakes that cause lavender to wither
Why does lavender wither? The problem is not always an improper amount of water. Sometimes, even the best gardeners make a mistake that causes the plant to lose its luster.
Beautiful, purple inflorescence and aromatic scent... Lavender is one of the most commonly grown plants in gardens. However, it can be fussy. You might think regular watering is key, but the cause might lie elsewhere.
Why does lavender wither?
One of the most common mistakes when growing lavender in a pot is using a pot that is too small. While lavender tolerates slight drying, it needs space to develop its root system. In a pot that is too small, the roots have limited space, and the soil loses moisture faster.
As a result, the plant cannot absorb the right amount of water, leading to drying out and withering. If your lavender is losing its vigour, consider repotting it into a larger container to allow it to develop stronger roots.
A common cause of lavender withering can also be soil that is too acidic. Lavender is a plant that prefers alkaline or neutral soils. The ideal pH for lavender is between 6.5 and 7.5. If you are growing lavender in your garden, avoid planting it near acid-loving plants such as azaleas or rhododendrons. To ensure proper conditions for lavender, it's worth checking the soil pH and, if necessary, using dolomite or another calcium fertilizer to raise its pH.
The problem can also be improper pruning of lavender, especially if it is too aggressive or done at the wrong time. This can weaken the plant and contribute to its withering. The best time to prune is early spring and summer, just after flowering ends. Regular pruning not only keeps lavender in good shape but also stimulates it to produce new shoots and flowers.
Plant diseases
Like any other plant, lavender is susceptible to pest and disease attacks. One of the most common pests is aphids, which weaken the plant, slow its growth, and deform the shoots. Another unwelcome guest can be the spittlebug, a tiny insect whose presence is recognized by characteristic white, foamy spots on the plant.
The most commonly encountered fungal diseases are grey mould and phytophthora. Grey mould manifests as a grey coating on the leaves and shoots, eventually rotting. Phytophthora, on the other hand, causes root dieback and wilting of the entire plant. In both cases, to save the lavender, it is necessary to remove the infected parts of the plant and apply appropriate fungicides.
