If there are too much plants than you can handle, you could always throw away some or offer to other willing people. As the plants get bigger, transplant them to bigger pots to allow them to grow there and plant them out next year. I don't know how fast they'll grow, let alone be ready for this year but it's up to you, look how big they'll get and decide there and then. I've often left perennials in pots (keep them watered!) while deciding where to put them in my flower bed. Hopefully there'll be more useful suggestions than I can offer.

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