It is just very difficult for new plants to compete with tree roots, especially in the shade. Add organic matter to the ...

The Tamaulipan thorn forest once covered 1 million acres on both sides of the US-Mexico border. Restoring even a fraction of it could help the region cope with the ravages of a warming world.

In Fielding Questions, readers also asked about cutting back ornamental grasses and pruning overwintered petunias.