Easter lillies up, but not blooming
Easter lily bloom is highly dependent on temperature. Greenhouse growers who force them into bloom for Easter carefully control the temperature in the greenhouse in order to get the crop timed correctly. Obviously, outdoors you have little control over the temperature, so you'll have to take what Mother Nature provides, although you can modify temperatures somewhat by using a cold frame or floating row cover to create a mini greenhouse over the lilies to raise the temperature a few degrees and speed growth. Similarly, during extreme heat, you could provide shade to cool them down.
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