Cosmos will flower more in poor soil, rather than rich, so avoid manures and fertilizers. Pinch out the growing point when plants are around 45cm (18") tall to encourage bushier growth and more flowering points. Water during very dry spells, but otherwise, Cosmos is well suited to xeriscaping. Seeds are easy to harvest and save. - See more at: http://www.westcoastseeds.com/productdetail/Flower-Seeds/Cosmos/Sea-Shells-Mix/#sthash.E2Q3xL9r.dpuf