Plants such as nettles thrive in nitrogen-rich soils, crowding out other, rarer flora on which moth caterpillars may depend.
Plant populations on these soils tend to show low density, but goatgrass can form dense stands on these soils, crowding out native species that have adapted poorly to serpentine soils.
Repotting often has the same effect, so don't repot unless the roots are so crowded no soil is left.
Most Americans eat foods manufactured from large-scale commodities grown chemically on impoverished soils, or from animals crowded into sheds and raised on unnatural feeds.
"When we went to Khavaran for first time, it wasn't like a cemetery at all, just piles of soil and crowds of mourning mothers," recalled Mohammadi.
But in 1904, soon after paths opened to the public, the garden's first director, Nathaniel Britton, noticed that the hemlocks, with shallow root systems, were suffering from the "trampling of the thin soil by crowds of people".
Millions of rural blacks are crowded onto "communal areas" of stony depleted soil.
On a crowded Saturday afternoon, Mr. Nasiatka pointed out root systems, once covered by soil, jutting out of the ground at the top of the falls.
Alternately, you could plant them in a pot with sandy soil, lest the low-slung, 1-inch-diameter magenta flowers get lost in a crowded bed.
Pharmacy windows are crowded.
