Don't plant lavender too early
You should only plant lavender outdoors when frosty periods are no longer to be expected. This is usually the case from mid-May - after the ice saints. You can then plant the plants in the garden until around the beginning of August, later it is better not to plant them out. Lavender planted too late does not have enough time to develop strong roots and thus prepare for winter.
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Pot planting possible almost at any time
In contrast to garden lavender, potted lavender can be planted at any time during the growing season between March and September - provided the plant is in a protected location. In the cold season of the year, lavender should be overwintered as cool as possible - but frost-free - whereby the plant stops growing as much as possible. This is why it makes little sense to plant or transplant during this period, as the roots cannot grow either. Indoor lavender should also be planted in spring at best.
Lavender can be grown from seeds from February / March on the windowsill or in the greenhouse if there is sufficient light - the plant is a light germinator. Bringing it early ensures that the lavender will still bloom in the same year. Even the early plants can only be planted from mid / late May, or even better in June.
Tips: Young lavender plants are quite sensitive to the cold and other unfavorable growing conditions. Older plants tolerate short periods of cold better, especially if they are well rooted.