- 1). Repot the plant in a larger pot early in the fall using a well-draining potting soil. The extra soil provides additional insulation as well as encourages root development during the remainder of the season. The new pot should only be one size larger than the existing pot. If it is too large, you risk overwatering, which can lead to root rot.
- 2). Bring the pots into the garage soon after the first outdoor hard freeze. There is no precise schedule. The timing will depend on the imminent weather as well as where the pots are located. You want to leave them outside as long as possible yet avoid having the root ball freeze.
- 3). Remove the dead top growth. If the soil in the pots is dry, water them as usual. Leave the pots in front of the garage door and open the door daily or every other day for a few weeks. This gradual decrease in light levels will simulate outdoor conditions prior to dormancy.
- 4). Place the pots in large plastic tubs and surround each pot in the tub with several inches of plastic foam peanuts or wrap them in bubble wrap several times up to the pot rim. Either of these materials will provide necessary insulation for the roots. Outside, the roots are underground, which is much warmer than ambient air temperatures. Protecting the roots this way simulates being underground as much as possible.
- 5). Cover the tops of the plants with a thin layer of plastic foam peanuts or mulch to protect the crown. Do not use sheet plastic. It is important that they have access to air or they can rot.
- 6). Check the plants once a month to see if they need water. If they are dry, supply a small amount of water. If they are frozen, do not water. Err on the side of dryness if in doubt.
- 7). Reverse the steps as spring approaches in a gradual manner over a period of a month: Remove the plastic foam, move them to the door and open the door periodically. When tulips and daffodils start peeking out from the soil outdoors, it is safe to bring your pots outdoors and resume normal watering and fertilizing. Do not expose them to direct sun immediately. One to two weeks in shady conditions is ideal.
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