Hiya rictic
Last year I grew Galaxy (Lathom Self Blanching). I got the seeds from Thompdon and Morgan
http://www.thompson-morgan.com/seeds1/product/603/1/ you can also get them from
http://www.alanromans.com/p-1808-celery-galaxy-lathom-self-blanching.aspx I haven't ordered anything from alan romans myself though so can't vouch for him, they are the very same T&M seeds I'm sure same pic if you read his blurb on
http://www.alanromans.com/t-faq.aspx it gives a clue they may be from T&M.
I grew them in my high rise bed. Everyone that eats celery liked them and made comments such as: "this ishow celery should taste", and "I don't mind it a bit green still tastes really good" (apparently americans eat it like that). I couldn't tell you if nice or not cos I absolutely hate the stuff, yuk.
They are a bog plant and drink a lot and are apparently hungry plants. I overwater my plants anyway so I'm ok with that. Haven't yet grown any other variety. Each one germinated just fine, I started them off indoors and transplanted. I used the cut and come again method on them instead of pulling whole plant up .........loads of stems on one plant. When cut and come again method used small stems grow in there place, they were fine as well. Last right until bad frosts. Can't remember when started them off but have a pic of them 5 inches high on 20th May outside, so probably started in early march.
Think planted about twelve and that was too many for OH and give away to son as there are so many stalks on the one plant........they must really trim them up when sold in supermarkets.
HTH