These can be sown indoors as with the tender herbs, or sow them outdoors in May in containers. Some suggest that rosemary needs 6-8 hours of full sunlight.During the winter, that may mean keeping a lamp on it after sun down. The easiest way to ensure it survives the winter is to plant rosemary in a container, and overwinter it indoors. Rosemary is a tender perennial herb. posted by jedicus at 9:33 PM on January 12, 2008 It will not survive outdoors in extremely cold weather. If you live in USDA growing zones 7-10, where the ever-flowering rosemary shrub is used as an anchor in the perennial landscape, you probably think I’m a little cooky. In our neck of the woods, however, USDA hardiness zone 6 , rosemary rarely survives the freezing winters outdoors. After the first hard freeze, apply a 3- to 6-inch-deep layer of chopped leaves, pine needles, straw or other organic material. If your potful of rosemary has gotten a bit unwieldy, as rosemary is wont to do, you can certainly give it a bit of a haircut before you bring it inside. In cold winters, bring plants under cover for protection. In other words, plants may do fine for a few years, and then we have one hard winter and the fun’s all over! Before we answer that question it's crucial to understand that the primary environmental enemy of rosemary is an over-wet soil and this is especially the case in winter when more rain falls. Rosemary is pretty hardy, in well-drained soil will easily survive winter and can be cut back in spring so long as you don't go all the way back to the woody stuff. While rosemary thrives in cool temperatures, it does not tolerate freezing in winter so must be protected in many areas of the country. Try mint, oregano, rosemary, thyme and sage. If you live in an area with winter freezes, don't assume that your rosemary will survive without help. Others note that it needs good drainage and that over watering can be a problem. Rosemary is a robust and hearty herb, but it is still a Mediterranean plant that can succumb to cold temperatures. Add crocks to the bottom of pots to aid drainage. But when the REAL Maryland winter returns (if it ever does), the plant will be toast. To save rosemary over the winter in cold climates, place the plant in a pot. Finally, indoor rosemary does best with cool (60F) dry air. Rosemary is traditionally a warm climate plant, but agronomists have been busy developing cold hardy rosemary cultivars suitable for growing in cold northern climates. However, quite a few herbs can be kept going, especially if you can grow them under glass. In areas where it remains below freezing for much of winter, planting rosemary in pots is preferable to ensure survival. Keep in mind that even hardy rosemary plants benefit from ample winter protection, as temperatures in zone 5 may drop as low as -20 F. (-29 C.). Rosemary can be trimmed in winter or you can wait until spring. The mulch will help protect the roots and help the plant endure freezing and thawing soil. Sage; goes a bit "loppy" in winter but rallies in spring; can be cut back quite hard like Rosemary so long as you don't overdo it Basil; very tender, also an annual in this country. Some herbs simply won’t grow in the UK over the winter: basil is an example, and chives will survive and return exuberantly in the spring, but won’t actually grow, even in a cold frame. Keep rosemary plants well watered during dry spells and feed with a general fertiliser during the growing season. Winter planted herbs are vulnerable to … And that’s true of any zone 8 plants, not just rosemary. Rosemary. Take steps to protect it. A warm spot near the house protected from north winds is the best bet. Rosemary does well in containers in a soil-based, peat-free compost. 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