You might take a group of plants like Echeveria and think you could pick them out of a lineup. Most of them form some sort of rosette, but then, there are other succulents that do that, too. You can’t ...

Walnut Creek’s Ruth Bancroft is a national authority on drought-resistant gardening. Twice a month, she and her staff share their knowledge with readers. Plants in the genus Echeveria are often ...