Ideally, prune the lavender plant in spring or early summer, just after new growth begins. Pruning in autumn can cause the plant to waste energy on new growth, leaving it vulnerable to frost. Do not prune lavender plants in the first year, when they are establishing roots. If the old, woody growth is already too large for your garden, consider taking several cuttings and removing the old plant entirely once the new ones have been established for a year. Division is a more rapid but riskier solution.
Opinions are divided on whether a younger or older plant has a lower risk from division. [3] X Research source [4] X Research source
Softwood cuttings use only soft, new-growth material from this year, that has not yet become brown and woody. These cuttings will grow fastest, but are only usable if the soft material is at least 5 in. (12 cm) long, and includes at least two leafy nodes. [7] X Research source [8] X Research source Hardwood cuttings include woody, brown stem material, but must also have at least an inch or two (2. 5–5 cm) of soft, new growth at the tip. These require a root stimulator to encourage root growth, available at a gardening store.
Check the label and ingredients of a root stimulator before purchasing. Select a root stimulator that contains a root hormone, not just fertilizer and vitamin B1. [9] X Research source
Terra cotta flowerpots are preferable to plastic ones due to their “breathability,” especially if you soak the flowerpot in water overnight before continuing to the next step below. [12] X Research source
Using scissors is not recommended, as they may pinch the stem and make it more difficult for roots to emerge. [13] X Research source
Be careful not to damage the bark while removing the leaves.
Greenhouse environments may be too damp for lavender cuttings. [17] X Research source However, if the cutting is looking limp or dry after one or two days, moving it to a greenhouse or under a plastic bag may help it retain moisture until it develops roots. [18] X Research source
There are several related methods of propagation referred to as “layering. " This one is simple and low-risk, but can be labor-intensive if you plan to create more than a few cuttings. Refer to the tips below if you want to turn your lavender plant into dozens of new cuttings instead.
Watering is not recommended while the plant is dormant for the winter. Mulch can help the soil retain water, but may cause plants to overheat during hot weather.
This may require you to include multiple clusters in one division.
Optionally, add a small amount of fertilizer high in phosphorus and potassium to the base of the hole as well. [21] X Research source
Pry down on the handle of the shovel as you move around the plant until the plant releases from the ground.
