‘Rosemary grows well from seed sown in spring, pricked out into individual pots and planted out the following spring,’ says Monty Don. See: Small vegetable garden ideas – from layout designs to the best crops to grow How to grow rosemary from seed The rosemary plants should be ready to plant out into their final positions in the garden the following spring. Keep watering, and when the roots fill the container, pot on again to a larger size. Pot them on into individual containers, using loam-based compost. To do this, you can give them a very gentle tug, and if you feel resistance it means roots have formed and your cuttings are ready for planting. In about four weeks’ time, check your cuttings to see if they have begun to root. Check regularly to make sure the soil is constantly moist and never dries out. Water the freshly planted cuttings, then place in a propagator, cold frame or on a windowsill. This is not essential, but can increase your chances of stronger, disease-free plants. Many gardeners first dip the stems in hormone rooting powder to speed up the rooting process, and to ensure more plants are successful. Either place several cuttings in a larger pot, or in a seed tray, inserting one per module. To root your rosemary cuttings, remove most of the lower leaves and push these clean stems into gritty compost containing a high proportion of vermiculite. If you are not able to immediately plant your cuttings, then you can store them for a short time in a sealed plastic bag out of direct sunlight. It’s important to use a sharp, clean blade or secateurs. Simply cut off shoots with no flowers – you’ll need about 3 to 5 inches – just below a branching point, or leaf node. However, many gardeners have had success in summer and fall, as long as the plant is not actively flowering. The best time to take cuttings from rosemary is in the spring, after the plant has flowered. 'Rosemary is easy to propagate from softwood cuttings,' says Hann. Learning how to grow rosemary from cuttings is the best way to cultivate new plants quickly.
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