how long does it take to grow rosemary
Germination Time. Rosemary seed takes 15 to 25 days to germinate under ideal conditions. Plant the seed about 1/4 inch deep in a well-draining germination mix. Water thoroughly and place the seed tray on a heating mat. Only about 30 percent of the seeds can be expected to germinate even under the best conditions, so plant seeds thickly.