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How to Grow Rosemary from Seed

Rosemary is a wonderful herb that is popular as both a garden herb and a culinary favorite. Unfortunately for those who live in the cooler zones (zone 6 and lower), rosemary is not winter hardy so it has to be treated as an annual or you have to bring the herb inside for the winter and try to keep it alive - which is not easy.

For those who have problems keeping rosemary alive from one year to the next, and those who like to have lots of rosemary in the garden, growing the rosemary from seed each year is a practical option.

The seed takes a while to germinate so you need to start it about three months before the warm weather arrives.  Place the seed onto a well drained base such as sand, vermiculite or very light potting mix. Cover the seed with a little more mix, water lightly and place the container in a warm location or onto a heat mat. Cover the container with plastic wrap until you see the seeds starting to emerge. As soon as you see the tiny rosemary plants starting to grow, it is important to give them a good light source and a warm environment. Do not expect germination of all the seeds as rosemary has a much lower germination rate than some other popular herbs such as basil.

Allow the rosemary to grow inside or in a sheltered area outside, until they are about 3 inches high and sturdy enough to handle. If the weather is warm outside, the seedlings can be put into the garden where they will continue to grow. Alternately, pot the seedlings into larger pots so that you do not have to disturb them if you want to bring them indoors for next winter. Use pots with several small rosemary plants to make rosemary topiaries. The small plants can easily be trained onto a hoop or other shape.

In warmer areas, zone 7 and above, your rosemary plants will be large enough to survive outside and give you pretty blue flowers early next year. Rosemary that is brought indoors will also flower in late winter to give you some winter interest when you really need it.

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Gardening Tip of the Day

  • Veteran gardeners often claim a drop of mineral oil placed on the end of a developing ear of corn will discourage earworms. But Bt (Bacillus thuringiensis) sprinkled on the emerging corn silk is more effective. The best way to avoid earworms altogether is by planting a short-season variety like ‘Early and Often’ or ‘Early Choice’ as early as possible. Earworms usually cause the most damage in late summer. So, if you can harvest early, the corn will be on the dinner table long before the earworms have a chance to damage the crop.