Took on another allotment plot this year which has given me the room for a 'proper' rhubarb patch.
I did'nt want to pay for established crowns and my existing plants arent yet ready for dividing so I decided to try growing from seed.
So far very impressed with the results, germination was good about 90%, no special requirements, they germinated just fine in an unheated polytunnel sown 3 to a 3" pot. they transplant ok too.
From mid April sowing I have 10 plants about 3" across. I expect it to be 2 to 3 years before picking but the seed is cheap and I already have a rhubarb patch so not in a hurry.
If anyone is thinking of increasing their stock I can recommend it as a viable alternative to division and a lot cheaper than crowns. Plus I like growing from seed