Pygmy sundews are (sub)tropical, but generally have a drier summer dormancy period. It's not necessary for all species, in particular Drosera scorpioides will grow year-round.
Thanks for the link, Fredg.
Pygmy sundews as a whole generally don't go dormant so long as the soil is kept sufficiently moist. There are generally a few that always go dormant anyway, and it can be very difficult to revive them but my roseana tend to do so readily. And pygmies are the only ones I can think of that do have summer dormant "hibernacula;" tuberous dews die back to underground tubers, South African species die to the roots (I believe species like hilaris and ericgreenii etc. included), and others simply stall growth until conditions become favorable again.
Petiolaris sundews also act like pygmy sundews in extreme draught, leaves shrivel and hairs are produced to protect the bud. D. hilaris is hard to find information on, mine in summer have produced a tight bud that starts to regrow when the summer heat(some years we don't have any) cools off and they are kept wetter again,
Last edited by corky; 03-20-2016 at 02:02 AM.
Forgot about the petiolaris group, yeah those guys are funky too (yet to grow them personally though); oh, and the word you're looking for is drought, draught is the old English spelling for draft
I wonder if D. hilaris kind of depends on the severity of conditions; some people I have heard it forms dormant buds for, while for a few others it dies back like cistiflora and its relatives.
I thought D. hilaris was a year-round sundew. Does it die back only if conditions are too hot and/or dry, or does it need a dromancy?