For several years now, I have been walking up to my local shopping centre which is on a major road. On the corner, there is a narrow strip of old gravel next to the bank, and a self-seeded native violet has been growing there for all this time and probably years longer. It has never grown any bigger, and every summer looks like it will be its last - it dries up in the summer heatwaves (days on end all summer of 35 degrees C) as it never gets any water except what rain can get past the small overhanging eave of the bank. Last year a vigorous weed looked set to thrust it aside, but that has not thrived after all (see it in the background) and the violet is back stronger than ever, with all the rain we've had lately. What fortitude!