Answer: Violas are often sold as cool season annuals to plant in early spring. They are usually planted in either full sun or all morning sun. Usually, they bloom very well until the weather turns hot for the summer, at which point they die back and may die out due to heat stress. Sometimes they self sow in the garden, so you may see them reappear again in the fall. They may also be sold in the fall, again as cool season bedding plants. Sometimes they will overwinter from a fall planting and rebloom the following spring. In my garden after blooming fall and spring they usually exhaust themselves and die off in the heat.
There are also some perennial violas however they would usually be sold in the perennial section of the nursery and marked as such. The perennials are usually sited in bright dappled light or morning only sun in rich organic soil that is evenly moist yet well drained.
I hope this helps!
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