I am currently growing D. Arcturi and live in NZ. Check out the NZCP Society for a little information!
Barry Rice has been growing these for many years. Since they have such a short growing period it is essential to feed them constantly. Search the ICPS forum for his cultivation methods.
I recall Barry posted some growing methods for D. linearis that involved aggressive feeding & long photoperiod. Don't recall anything about him & D. arcturi - would be interesting to see how this plant responds to those conditions - especially since almost everything posted is about some version of a failure...You know what? I think I'm confusing these with D. linearis on ICPS. Same cultivation problems though. Memory is the second thing to go.
not that i've been studying this plant for years, but im betting they occupy the same ecological niches found in their respective hemispheres. what works for linearis will probably work for arcturi as well.
Sorry for my lack of clarity in my email, I meant a 50:50 sandeat mix. My standard mix for most Drosera.
I grow them under lights in a terrarium for about 3 months, feeding them nearly daily. There's nothing magical about the water level---the pots are about 5 cm tall, sitting in 2-3 cm of water at all times.
At the end of the growing season, the plants form hibernacula. I let them sit in the terrarium for a few weeks in this state, then put them in baggies and keep them in the fridge.
I'm old-school about my refrigeration, and so I store them there for about 4-5 months. However, I've talked to some who see no point in storing their plants for more than about 3-4 weeks in the fridge. I will point out that their plants have effectively two or three growing seasons to each of my own, and their plants grow faster as a result!
Cheers
Barry