This applies to non-plant creatures also which leave eggs or pupae in the soil. There are trees along rivers in percolated soils. The grassland here now is not native but introduced species. Freshwater marsh, which is highly productive. Their two to five mile-wide floodplain attest to the flooding possible.
Oaks can photosynthesize at high temperatures , but they are being wiped out by grazing and farming.
Alkali sink scrub, which occurs in low flat playas like the Tulare basin, a desert-like habitat. They are mostly in California, but occur also in Baja and South Africa. They are a tiny little ecosystem with no transition in or out. It is a discrete aquatic ephemeral ecosystem, containing food and what eats the food. Occasionally birds bring things into the pool.