When to prune blueberries?
- Botanical name
- Vaccinium corymbosum
- Family
- Ericaceae
Blueberries are pruned from February to April. They are planted from October to March. They are harvested from July to August.
Blueberries are woody perennials. The edible part is the fruit.
Blueberry needs acid soil with a pH between 4.5 and 5.5. Where garden soil is not acid, it is planted in a container with an acid growing medium. Tap water raises the pH, so rainwater is used for watering.
The flower buds of a blueberry are plump and the leaf buds flat. Pruning waits until the two can be told apart, because only then is it clear where the fruit will be. Old shoots are removed at ground level, so that about a third of the bush is old wood, a third middle aged and a third young.
Blueberry is partly self fertile, so even a single bush carries fruit. A second variety flowering at the same time gives more berries and larger ones.
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Blueberries through the year
- pruning
- planting
- harvest
In short
Growing conditions
Pests and diseases
Listed here is every problem for which the sources name this plant as a host. The problems are not listed in order of how common they are.
- Signs
- Colonies of small aphids sit on the shoot tips and the underside of the leaves. The leaf curls and puckers, and sticky honeydew is left on everything below. The viruses they carry are more dangerous than the feeding itself.
- Prevention
- Go easy on nitrogen, because soft sappy growth is what aphids are looking for. Encourage the predators (ladybirds, lacewings, parasitic wasps). Use a reflective mulch, which puts them off settling, and a strong jet of water to knock the colony off the tips.
- What to do
- Potassium soap works on contact and only while it is wet, so it has to reach the underside of the leaf. On drought-loving plants and in heat it can scorch, so apply it in the evening.
- Signs
- A white, floury coating spreads over the leaves, first on the lower and older ones. The leaf under it yellows and dries up. The fruit stays small, because the plant loses leaf surface.
- Prevention
- Plant resistant varieties, leave an airy spacing and sun, and clear the debris at the end of the season. Unlike most fungi it is not helped by wet foliage, since it spreads in heat and high air humidity, in a dry summer too.
- What to do
- Oil products meant for powdery mildew on the squash family work on contact. They do not cure a leaf that is already affected, but they stop the spread to healthy ones. On herbs cut the affected shoots back instead, since the new growth comes clean. On ornamental perennials what is left is spacing and moisture.
- Signs
- A ripening, still firm fruit gets tiny puncture holes and collapses within days. In the flesh there is a white larva. Unlike the ordinary fruit flies this one attacks undamaged fruit that is not yet overripe, so it is not a sign that the fruit has already spoiled but the reason it spoils.
- Prevention
- Pick as the fruit ripens and leave no overripe, damaged or fallen fruit on the plant or under it. Pheromone traps hung on the shady side of the bush or the tree do not put the population down, but they tell you whether the fly is already about and when it is time to protect. In a garden beside a wood or scrub hang them at the boundary first, because the fly overwinters in the wild.
- What to do
- Once the fruit is set, protect it with a very fine net, the mesh under one millimetre, because an ordinary net against birds does not hold the fly back. On top of that, strict hygiene: remove and dispose of every overripe and fallen fruit.
- Signs
- The half round notches along the leaf edges in summer are the work of the adult beetles and do the plant little harm. The larvae are the danger: white grubs with a brown head eat the roots, the plant suddenly drops its leaves and dies, most often between autumn and spring.
- Prevention
- Most at risk are plants in pots and troughs. In a bed the damage is rarer. At repotting check the roots and the compost and pick the larvae out. You find the adult beetles in the evening with a light, when they crawl over the plants.
- What to do
- Pick the adults off in the evening, set sticky traps indoors and change the compost, removing the larvae as you go. There is no insecticide. As biological protection, water beneficial nematodes into the compost at the end of summer, while the larvae are still small.
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Related plants
The plant below is in the same botanical family (Ericaceae).
Sources about the plant: Clemson Cooperative Extension, GBIF Backbone Taxonomy, Iowa State University Extension, NC State Extension Plant Toolbox, Oregon State University, Penn State Extension, Royal Horticultural Society, Wikidata. Checked between 14 and 28 August 2026. The problem descriptions also draw on: EPPO Global Database, KGZS, UF/IFAS Extension, University of Illinois Extension, University of Maryland Extension, University of Wisconsin-Madison Division of Extension, Utah State University Extension.