Durango Bolero marigolds flower without letup through September heat, their two-tone petals holding rich color even when most annuals fade. The blooms layer rust and gold in a full double form, sturdy enough to stand up in rain.

These stay bushy and manageable—no constant pinching required—and seed themselves reliably if you let a few flowers go to ground. Plant them in decent soil with good drainage, give them sun, and they'll shoulder their weight all season without complaint.