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Rosmarinus officinalis (or Salvia rosmarinus). Rosemary is an aromatic herb with upright, woody stems and narrow, needle-like, dark green leaves that can be used fresh or dried. A perennial in hardiness zones 7-8, it does not survive frost, so bring rosemary indoors at temperatures below 8ºC if you want to continue growing it the following year. A low germination rate is normal for that herb.
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Growing tips
Conditions of germination:
- depth of sowing: 2 mm
- optimal temperature for germination: 20 to 30ºC
- time for germination: 14 to 28 days
- although optional, cold treatment (stratification) facilitates germination and increases the germination rate. There are several methods of stratification. Here is one: sow the seeds in moist potting soil, cover the pot with a plastic bag or place it in a plastic container to prevent it from drying out. Place in the refrigerator for 2 to 6 weeks, checking a few times that the soil is still moist. Then take out the pot and expose the seeds to the above germination temperatures.
When to sow:
- indoor sowing 8 to 10 weeks before the last frost date in your area
Sowing technique: in pocket
Inside the same hole, sow 3 to 5 seeds spaced 1 to 2 cm apart; when the seeds have germinated and the seedlings have reached a height of 5 cm, keep all the seedlings if space is available or keep only the most beautiful ones. Transplant into individual containers while waiting for transplanting in the garden.
Transplant outdoors:
- after all danger of frost has passed and the soil has warmed
Distance in the garden:
- between plants: 50 cm
- between rows: 75 cm
Height of plants: 60-90 cm (less in the first year and more in the following years according to the harvests)
Soil: well-drained, rather poor
Exposure: full sun
Days to harvest: 80 to 90 days
Specificities:
- the use of a bottom heat mat can improve germination (after the cold stratification if applicable);
- Rosemary grows well in pots;
- this perennial plant is known to live 15 to 20 years
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