Hi, I've been watching the magnificent Private Life of Plants by David Attenborough, and was struck by some of the plants he shows in the Arctic, Wexplaining that their survival is largely due to their small size, being very close to the ground and as such less vulnerable to being blown over by the severe winds. A bit later he says tat it is the environmental conditions that "compel" the plants to grow low. This has me wondering - is it that the plants somehow "know" to exert their growth only so far in order to reap maximum environmental advantage and thus survive the harsh conditions, or is it purely that they have evolved to do this? I know essentially that it is the latter, but the use of the word "compel" made it seem as if the growth habits of those individual plants were affected by their environment, and that had the weather somehow grow less harsh they would have extended their growth in a single lifetime rather than through evolution. Most of the plants appeared to be Saxifrage-like flowers, and I can say with certainty that one was the Arctic poppy, Papaver radicatum.