Viewing tabasco's Garden Diary: Propagation notes for Butterfly Host and Nectar Plants
Friday, July 16, 2010
Buddleia from seed and cuttings
Buddleias may be propagated by stem cuttings or by seed, with cuttings being the only option to reproduce named clones. Cuttings may be taken from softwood in May, half-hardened wood in July or from mature wood in October.
Short, side shoots with many nodes work the best. Treat the cuttings with rooting hormone (1000-3000 IBA) and place them under mist.
The tiny buddleia seeds should be collected from November to February when they are normally released. The seed require a short cold stratification period of only 4 weeks. They will germinate in 3-4 weeks if surface sown under light at 70ºF to 80ºF.
Grow the seedlings until they have 2 or 3 leaves but take care to avoid damping off by providing air circulation and watering carefully. Harden off the seedlings by moving them outside after the last frost to a protected location and gradually increase the light level and moderate the temperature until they are growing in full sun at outside temperatures.