The local Ponderosa pines make use the moisture held in the porous soil above the caliche barrier.

The building is slowly sinking due to the porous soil and the cement that was used for the restoration.

It requires loose, porous soil and long periods of dry conditions.

There was occasional rain, but it seemed to sink immediately into the porous soil.

It grows in semi-arid and arid environments and seems to favor light, dry, porous soils.

Even some supporters think the water might evaporate or seep into the porous soil before it could be useful.

Mixed with 15 percent compost and 30 percent sand, this porous soil (www.stalite.com, phone 877-737-6284), has to be fertilized about once a month.

This succulent, like most of its kind, requires porous soil and can only tolerate light frost.

A porous soil and year-round protection from excessive wet are needed, drought can be tolerated.

The genus grows in meadows and verges on slightly wet porous soils.