Clivia.

Yes, and some of those seeds will benefit from or need a period of cold to help break dormancy. So winter sowing will provide this in your zone. Most perennials won't bloom until next year anyway. So you really don't need to get them going as early as possible (or do you?). Do you have seeds of all of these already? Your list is so large. Can you narrow down to a few must-haves?

Caesar's Weed Here is a link that might be useful: (Urena lobata)

Margaret My jades flowered first time in 2016. All of those flowered again in 2017, plus few more for first time. I mentioned many times before that I don't fertilize my succulents - not only jades. While outdoors, they get watered mostly when it rains. If it doesn't for a while, then I water them with rain water from rain barrels. Maybe once or twice during Summer, they get watered with water that contains some fertilizer - if I have any left from watering vegetable garden. I do not even know how they would grow if they would be fertilized regularly/with every watering. After bringing them indoors, I continue watering with rain water I saved from rain barrels. I do not know how old are ones that bloomed. They all stated from a branch I got from my friends - it was nice and quite large. I killed it, unfortunately, by overwatering. Only left were few very shriveled cuttings. They didn't look that great. They were potted, many survived, and that was start of plants I have today. Here is photo of those cuttings (not very good one) - they are NOT in water, just suspended in glass jars and a vase:So while they look like 6yrs old, they must have some 'age' left from original plant. Biggest blooming plant is now about 22" from soil line; smallest is 14" tall. Here is photo of few smaller ones outdoors (July 17, 2017 @1:45pm...:):