Step 1: Trim Below Leaf Joint
Cut sections 3–4 in (8–10 cm) long from the tips of healthy, young, nonflowering stems, using pruners or a knife. Place in a closed plastic bag out of the sun as you work. Trim the cutting just below a leaf joint. Remove the leaves from the lower part of the cutting so that only 2 or 3 remain at the top.
Step 2: Plant, Water and Label
Dip the end of the stem in hormone rooting powder. Push the lower half into the potting mix, around the edge of the pot when there are several cuttings. Gently firm in, water thoroughly with tap water, and label. Enclose in a plastic bag or propagator. Most will root best at 59–70°F (15–21°C).
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Tender plants and half-hardy annuals and perennials are started indoors, since they need artificial warmth or frost-free conditions. The seeds of most hardy plants can be sown indoors, too, if you want closer control of their germination and early growth.