Calla Lily Grows With No Flowers

I live in zone 7 and my brother gave me a rhizome from a white calla lily. It has been in the ground for 4 years. It always produces leaves every spring however no flower. It is in a part shade/part sunny area and the soil is moist. Help! Do I need to transplant is somewhere else in the backyard?

Calla lilies Zantedeschi aethiopica

There is the possibility that the plant is not receiving enough sunlight. Calla lilies only need partial shade during the hottest part of the day. If a flowering plant does not receive adequate light, it will only produce foliage and abort flowering.

Too much nitrogen fertilizer in the soil will produce green leaves at the expense of flowers. All bulbous and rhizomatous plants should have either bonemeal or a fertilizer with a higher percentage of phosphorus added to the soil in which they are growing. 5-10-5 is a good chemical fertilizer for these plants. They are hungry plants and should be given a dusting of 5-10- 5 once a month while they are actively growing.

Of course, the calla lily must always have a constant supply of moisture. Zantedeschia aethiopica, for example, will thrive in a muck soil covered by water. On a final note, the calla lily will not do well if the night temperature drops below 50°F.