Propagating Lavender from Cuttings
Lavender is easy to grow from cuttings in spring or fall. Take young stems with a heel attached and dip them in rooting compound. Plant the stem cuttings in sandy soil in a sunny spot that's sheltered from the wind. Lavender is also easy to propagate indoors if you have a sunny window.
Propagating Lavender From Seed
Set lavender seeds beginning in summer and through the fall months. Slow to germinate, lavender seeds require patience. It will take about eight weeks for the seeds develop enough to transplant to their final location. The fresher the seeds the better, so don't use last year's leftovers. Plant more seeds than you think you'll need, because you'll probably have some losses.
Special Note: Lavender seeds don't always breed true, and propagating from seed can sometimes yield surprises.
Propagating Lavender By Division
Larger lavender plants can also be divided, which is a good way to keep them from getting too woody. Be careful to make sure that the roots are evenly allocated, and be sure to replant the resulting "bibs" at the same depth as the original plant.
If you are keeping lavender indoors, it needs good air circulation, so give it plenty of space. Let it dry out a little between waterings.
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