Viola sororia is a PERENNIAL growing to 0.1 m (0ft 4in).It is hardy to zone (UK) 4. It is in flower from March to June. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects.Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: acid and neutral soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.
Common Blue Violet Care
Viola Sororia
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How to Care for the Plant
Water
Water regularly, but allow the soil to dry out between waterings. They can tolerate some drought but will bloom best with regular watering.
Fertilizer
Use a slow-release fertilizer into the soil. Fertilize in the spring and again in late summer to promote a fall bloom.
Sunlight
Violas like full sun, but not the heat it brings. This isn’t a problem in cool spring temperatures, but when planting in the summer, make sure they get some shade during the hottest part of the afternoon. Mulch and water will help offset the stress of high temperatures.
Soil
Prefers a cool moist well-drained humus-rich soil in partial or dappled shade and protection from scorching winds. Tolerates sandstone and limestone soils but becomes chlorotic if the pH is too high. Prefers a pH between 6 and 6.5.
Temperature
Violas love the cool weather of early spring and thrive in milder temperatures from 40 to 70 degrees Fahrenheit. With proper care, they can bloom all summer and most will bloom again in the fall. Or, particularly in hot, southern climates, they can be removed and replaced with another flower during the summer, then planted again when cooler weather returns in the fall.
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