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Water your plants until they are moist, but not soggy. Prune vinca minor in the spring to prevent invasion. Combat rust and grey leaf spot disease using pesticides or selective removal.
Through the first season of growth, ensure that all plants are evenly wateredthis promotes proper rooting. In terms of frequency, this depends on location. For sunny spots, daily watering is ideal. For the first season, deep, infrequent watering is preferable. Skip watering on wet, rainy days. Use pruning shears to cut any damaged, dead, or dying leaves back to the node located right before the damaged region. Keep as many branches with closed buds as possible, as this will ensure your vinca minor can continue sprouting. Cutting back your vinca minor is not necessary, and should be reserved for situations where growth is becoming invasive. Cuttings left from pruning can be used for propagating more plants. Although periwinkles are robust and thus very resistant to pests and diseases, they are vulnerable under certain circumstances. For example, rust (known for causing round, black-brown spots) can infest at locations that have high humidity and requires pesticide treatment. Grey leaf spot disease can be spotted by its brown patches, and at early stages it can be fought by removing affected parts of the plant. Remove rust with chemical agents or remove affected plants completely. Plant parts affected with grey spot should be removed immediately. Always make sure plants are spaced enough for adequate air circulation and your planting region is not too humid.