In some Aloe species, as in this rosette of Aloe pretoriensis, drying out of the leaf-tips occurs even when growing conditions are favourable.
A. pretoriensis is a joy to the sunbirds who visit the flowers for a serving of nectar from each freshly opened perianth. This is the reward on offer for performing routine pollination services in a long-standing, mutually beneficial arrangement. Even when a visitor may be disappointed by an earlier visitor having taken the booty, some grains of pollen may stick to its body for a fruitful deposit at the following flower where it may be luckier.