I am trying to grow rosemary from starters.
I am based in In California, San Francisco Bay Area.
I dug up an area about what people are recommending on the other rosemary answers here. 30cm x 30cm wide + 30cm down, and combined the area for 6 of them. The soil had some clay about 20cm down or so, but this didn't seem to get in the way too much when I checked the other day. I sprinkled a few quarts of Kellogg organic Amend (.3% Nitrogen, mostly insoluble; .1% potash, .1% phosphor something; 1% calcium. w/gypsum, poultry manure, and compost) and mixed it in pretty well, then planted the starters like a foot apart. It's been about a week, and the rosemary seems to be slowly burning or drying, despite lots of watering.
Did I burn them with too much nitrogen in the additive? Or maybe I didn't break up the root clusters sufficiently and water is just bouncing off them? Could the compost be too old/dried up? We used half of it a couple years ago, and though it's been out of the sun, either in the garage mostly, it does warm up. It was never really moist, but what do I know.