Attractive subshrub with very fragrant, greenish white flowers tinged with purple. Famous for being host plant for the monarch butterfly. Can be seen in summer covered with the green caterpillars that will become monarch butterflies. It grows 2-4' tall in full sun and can handle some shade.
There are 75-100 seeds per packet, enough for 20 to 30 plants. Sow in early spring; it likes some warmth to germinate. It goes dormant in the summer. Spreads through underground rhizomes.