Propagating rosemary is a really great way to get value for money out of shop-bought herbs. It’s also an excellent way to keep it fresh – no more forgotten bags of damp, brown rosemary at the back of your fridge. It will happily live in a glass of water like this for ages and ages.
Take a stem of rosemary (or multiple stems, if you like) and pull off the leaves from about the bottom third. Cut the very end off the stem, so you have a fresh end to encourage root growth.
Pop into a glass of water and set on a windowsill.
You need to change the water every four or five days. After a few weeks, you’ll see little white roots starting to grow. I’ve found they root quicker if the stem is resting on the bottom of the glass, rather than floating in it.
Once you’ve got a good, strong-looking root network going, you can transfer your cutting into compost.