Answer: You can plant them outside once they are conditioned or hardened off. To do this, place them in a sheltered location out of the wind and in the shade. Protect them on nights when temperatures fall below 40 degrees until they are planted in the ground. Gradually move them into sunnier positions over about ten days. Keep the soil moist but not soggy and remove the flowers when they fade. When you are ready to plant, plant them at the same depth as they grew in the pot and plant the entire rootball, soil and all. Water to settle the soil, and allow the foliage to grow, mature and ripen naturally to help replenish the bulb. Next fall whent he bulbs begin to grow again and again early next spring just as the tips begin to show, apply some compost and/or a complete fertilizer according to the label instructions. I hope they come back for you.
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