check this out
http://www.thegardenhelper.com/kale.htmlI found a couple of sites with differing information. On one site a lady was posting about how she loves to grow Kale close to San Franciso. I'm not sure where in CA you are - you may not get as cold as SF.
As far as sprouting, I think it takes from 1-2 weeks.
Some flowering kale has leaves that are lacy with intricate margin patterns. Foliage of both is bluish green at the base, with white, yellowish white, pink, pale purple and pinkish purple margins. Color is best in full sun and after the first frost.
Like their vegetable relatives, flowering cabbage and kale can be planted about now, but instead of getting harvested in winter or
spring, they can be left in the garden until it is time to plant warm season annuals. They are biennials that will eventually bolt and bloom, but their tall
flower stalks are unremarkable amid their basal foliage as it begins to wither.
Flowering cabbage and kale grow slowly from small cell packs, so they should be planted while the warm season annuals are still blooming. Unlike warm season annuals that have the advantage of increasingly warm weather to accelerate growth, flowering cabbage and kale grow slower through their season as the weather gets cooler. They can be planted among warm season annuals to outgrow and replace them as the warm season ends. Eventually, the remnants of the warm season annuals can be pulled out from between the maturing flowering cabbage and kale.
Soil pH 5.5 to 6.5 - Kale is best grown as a fall crop, for the summer heat makes the leaves bitter. Start the
seeds indoors 6 to 8 weeks before the first fall frost. Transplant outside 3 to 4 weeks later, spacing 12 to 18 inches between the plants. To avoid insect damage, cover the entire row with a floating row cover at planting time, removing only to harvest your crop. For best flavor, harvest after the leaves have received a light frost. Kale is very hardy and may be harvested well into the fall and early winter.
Kale is a cold-hardy crop producing "greens" high in nutritive value. It not well adapted to hot weather. Best quality is produced where summers are cool or when it is grown into the fall or winter. Varieties of kale "greens" are of two types. Scotch types have gray-green and very curled and crumpled leaves while Siberian types are blue-green and less curled. Both dwarf and tall types are available with the dwarf types being preferred. Collards are similar in nutritive value but much more tolerant of warm weather.