Due to the high proportion of essential oils, pests such as aphids, spider mites and other vermin avoid the intensively scented lavender. For this reason, lavender can also be used as a natural remedy against such plant pests. However, weakened plants are often attacked by fungi and die as a result.
Waterlogging causes root rot
In particular, waterlogging or generally too high humidity - which also includes high humidity - is a big problem for lavender. Wetness causes the roots to rot and die. Paradoxically, the plant dries up as a result, because the damaged roots no longer get enough water into the parts of the plant above ground. This phenomenon often occurs in relatively mild but wet winters - and when adequate drainage has not been provided in advance. Too frequent and / or incorrect watering also leads to root rot.
Treat fungal diseases quickly
Such diseased and weakened lavender plants are very often attacked by fungi, which quickly kill the plant. The so-called Phorma Lavandula, also known as lavender death or lavender death, is particularly feared. This fungus first causes brown, then black spots, mainly on the leaves. These should be removed as soon as possible, only then does the plant have a chance. Fungal diseases spread very quickly, so you should always keep a close eye on your lavender.
What to do with rotting roots?
With a little luck, you can still save lavender with rotting roots. The following measures are necessary:
- If possible, dig out planted lavender with the entire root ball.
- Remove the soil and check the roots.
- Cut away rotting roots with a sharp and clean cutting tool.
- Use a knife if possible, as scissors will squish too much.
- The cutting surface should be set at an angle.
- Plant the lavender in fresh, dry soil or in a new pot with fresh substrate.
- Water a little!
tips and tricks
You can also use an infusion of dried lavender flowers or lavender oil to combat pests such as aphids on other plants. Let about one to two handfuls of flowers steep in a liter of boiled water - if possible for several hours - and spray the affected plants with the cooled lavender water.
IJA