Pruning lavender depends on the type of lavender you’re growing. English lavender (Lavandula angustifolia) is the most commonly grown. It is very well adapted to prolonged drought and preserves water effectively so will hardly need watering unless it is wilting. If you are growing lavender in a pot or tub, you will need to water it more frequently but not much, only when the soil has dried out for a couple of days. Lavender is a very simple plant to prune; for the first year of its growth you should leave it completely alone and then each year after flowering in the autumn, you should cut the top six inches of growth off. Doing this will keep an English lavender plant compact for many years and a well-pruned plant can last for 20 years or more without becoming woody. Lavender is easy to propagate so you can take some cuttings and replant to grow for the next year. Alternatively, if you want to encourage new growth at the base of an existing long-standing plant, you can do so in three stages:
1)Cut the foliage back about one third in spring, which will cause the lavender to put on new bushy growth.
2)Leave the new growth to develop for a month or so and then cut back that growth by half, which usually causes foliage to appear at the base of the plant.
3)If the previous step worked prune the old growth so it is approximately 5cm above the new growth.
It is important to remember never to prune into old wood that has no new growth from it as it will never be productive again.
1)Cut the foliage back about one third in spring, which will cause the lavender to put on new bushy growth.
2)Leave the new growth to develop for a month or so and then cut back that growth by half, which usually causes foliage to appear at the base of the plant.
3)If the previous step worked prune the old growth so it is approximately 5cm above the new growth.
It is important to remember never to prune into old wood that has no new growth from it as it will never be productive again.