Erigeron speciosa (ee_RIDGE-er-on) also known as Fleabane,grows in zones 4-8. Just cover the seeds lightly with soil and keep at a temperature of between13-18C(55-64F). They should appear in 2 to 3 weeks..They grow 18 inches tall and love full sun.
Eryngium amethystinum(eh-RINJ-ee-um)also called Sea Holly likes zones 4-7. Cover the seeds lightly with soil and grow at a temperature of 18-25C(64-77F). They should appear in 5-10 days.They grow 2ft.tall and love full sun.
Eupatorium coelestinium (you-pah-TOR-ee-um).Also called Hardy Ageratum. They like zones 5-8 and grow 2ft. tall and like partial shade to full sun.To start their seeds cover them 3 times their size with soil and grow at a temperature of 18-22C(64-72F).They take 2 to 3 weeks to appear.
Filipendula ruba (fil-ih-PEN-dyoo-luh)is also known as Meadowsweet. It likes zones 3-9and full sun.It grows from 4-6ft.tall.To start it's seeds you lightly cover them and grow at a temperature of from 15-22c (59-72F). They should appear any where from 14-35 days.

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