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The sun-loving lavender originally comes from the Mediterranean region and is therefore - with the exception of real lavender - not hardy. Seedlings and young plants in particular are very sensitive to cold. In order for the subshrub to thrive and bloom luxuriantly in your garden (or in a pot), it needs warmth in addition to the right location and optimal care. In order to successfully grow lavender, it is therefore important to plant at the best possible time.
Don't plant lavender too early
You should only plant lavender outdoors when no more frosty periods are to be expected. This is usually the case from mid-May - i.e. after the ice saints. After that, you can place the plants in the garden until around the beginning of August; it is better not to plant them out later. Lavender planted too late does not have enough time to develop strong roots and prepare for winter.
Pot planting possible at almost any time
Unlike garden lavender, pot lavender can be planted any time during the growing season between March and September - provided the plant is in a sheltered spot. In the cold season, lavender should be overwintered as coolly as possible - but frost-free - whereby the plant stops growing as much as possible. Therefore, planting or transplanting does not make much sense during this period, since the roots cannot grow either. Indoor lavender should also be planted in the spring at best.
Lavender can be grown from seeds from February / March on the windowsill or in the greenhouse with sufficient light conditions - the plant is a light germinator. Preparing early ensures that the lavender will still bloom in the same year. Even the plants that have been brought forward can only be placed in the bed from the middle/end of May, or even better in June.
Tips: Young lavender plants are quite sensitive to cold and other unfavorable growing conditions. Older plants tolerate short cold spells better, especially if they are well rooted.