How could I plant flower bulbs in large planters in the fall?

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I have a number of giant pot-planters (mostly are resin/poly due to the xxxlarge size) . I'd like to put bulbs in them to bloom in the spring, but the pots will not be protected/covered due to their size and location. Would they "winter over" okay, or should I cover them (mulch, or?) for added protection? When is the best time to plant? Just ordinary soil mix, no additives, right? BTW, I live in NC. thank you for your advice!


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