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You can cross-pollinate basic flowers growing in your garden with other flowers of the same type. It is possible for cross-pollination to fail, but if it is successful, you'll get new seeds. Some seeds may even be for rare flowers. Please note that the original flowers used in cross-pollination will disappear after being used.
It is also possible to cross-pollinate in other players' gardens. If your garden is used in cross-pollination by another player, you will receive one pouch of friend powder each time. You can receive a maximum of up to 50 pouches of friend powder per day through cross-pollination.
*Note: You can also receive friend power by watering another player's garden.