Taking cuttings

Smhdwdcuttings2Summer is a good time to take semi-hardwood cuttings of your favourite evergreen perennials to add to your garden or share with friends. The Full Moon phase is best for this job as root growth establishes more quickly when cuttings are taken in this phase.
Semi-hardwood cuttings are sections of stem that have stiffened enough not to wilt easily. Cuttings should be at least 10 cm long and contain about 5 nodes, so that at least 2 nodes can be covered with mix, and you have two sections for growth. A node is a joint in the stem where leaves or roots can form – and indicated by a line on the stem or a leaf scar. Pinch out the very tip of the cutting, and leave foliage on the next two nodes, then carefully remove foliage from the lower nodes and trim the cutting just below a node. (You will find a lot more detail about preparing different types of cuttings in Easy Organic Gardening and Moon Planting.) Then poke the cutting into a pot that contains organic potting mix with some washed river sand added to ensure easy drainage.
This week, I’ve been taking cuttings of thyme, rosemary, Arabian jasmine, zonal geraniums and some Hawaiian hibiscus varieties. We replace our commercial perennial herb plants every three or four years because younger plants produce the best growth for harvesting.
I cut the remaining leaves in half on geraniums and hibiscus (and any plants with large leaves) to conserve moisture in the cuttings, but leave some leaf material to photosynthesise (make energy to grow). Dipping the base of the cuttings in certified-organic honey can help stimulate root growth – you only need a teaspoonful in a shallow dish. I water the pots with an organic liquid fertiliser and poke the cuttings into the mix against the edge of the pot as it helps support the cuttings. The cuttings are kept consistently damp in a warm spot out of direct sunlight until they have formed roots and are ready for putting in individual pots or planting in the garden.
Most experts recommend that cuttings should be covered. However, we have found that the perennial culinary herbs, lavender, and a lot of plants with furry leaves don’t like the humidity provided by a cover. However, the pots of jasmine, hibiscus get covered with a large plastic juice or soft drink bottle with the base removed and the lid intact. At the first sign of new growth the lids will be removed to allow some ventilation.