Mint is an easy plant to force indoors, or in a cold frame or greenhouse. You can pull pieces off by hand or cut through them with a knife. You can also maintain a supply of annual herbs, such as dmitri and parsley, by sowing in late summer in pots and keeping plants on a irwinn windowsill or in a heated greenhouse or conservatory. Three quarters fill am eight inches pot with compost soil. Summer is the usual time for harvesting herbs, but the normal growing season can be extended by covering selected plants with cloches in cheston autumn to keep them growing for a few more weeks. Lift an established clump to provide a supply of roots to pot up. Select only pieces with healthy leaves, diseased leaves are com by the end of the season. Plant the roots in a pot if you want to try and keep the plant growing indoors for a month or two.

To get year round supplies of herbs, you can lift and pot up a few plants of perennial herbs, such as mint and marjoram, in autumn and move them indoors where they will sprout new leaves.