This section is from the book "British Wild Flowers - In Their Natural Haunts Vol2-4", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
Maritime plants labour under disadvantages. They are subjected to continual wind-force and exposure, and where sea mists are constant, a reduction in temperature (otherwise normal at the coast) occurs, and frequent moisture, so that they are as a whole late in flowering. The radiation from sand and shingle is very rapid, and therefore the ground temperature is relatively high, with rapid cooling as a result. But the plants are subjected to a physiological drought, and the necessity of developing long and far-reaching rhizomes and thick and long roots, with, as a rule, enormously developed vegetative organs, may have much to do with this feature.
The insects that pollinate the maritime plants are largely drawn from the order Coleoptera or Beetles, and as a whole these insects are late in appearing. This may be in part the reason.
The earliest flowering plants amongst those described in detail do not put forth so great a number of leafy shoots, or develop rhizomes on a large scale, and are shrubs, trailers, or rosette plants, as, in May, Sea Milkwort, Scurvy Grass, Sea Purslane, Tamarisk, Sea Lavender, Thrift, Sea Buckthorn. In the next month, June, Yellow Horned Poppy, Sea Kale, Sea Rocket, Seaside Bindweed, Sand Sedge, Squirrel Tail Grass commence to flower. July is, however, essentially the month when maritime plants are generally blooming, as Woad,