Blueberry |
Vaccinium spp. |
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Blueberries are native to North America and Canada and have been collected by native people for thousands of years and later by Europeans. Blueberries were used in a wide range of foods including drying the berries for use during the long cold winters. Blueberries are part of the Ericaceae family, includes azaleas, rhododendrons, heaths and heathers. Cultivation started seriously in the 20th century and now there is cultivation world wide. Blueberries are separated into three species - Lowbush, Highbush and Rabbiteye. Rabbiteye varieties are not worried about drought, heat and soil type as the other two are. Blueberries are the queen of the berryfruit as they have no thorns, not invasive, no need for support or spraying. They are easy to pick and last well.
Landscape Value
Blueberries make an ideal hedge or stand alone specimen. Perfect for growing in a container. Attractive for their foliage, flowers and autumn colour.
Nutritional Value
High in antioxidants and anti-inflammatory properties which is enhanced the longer the fruit is left on the bush. Reasonable levels of vitamin C, A, E & several B, they are also a good source of dietary fibre. Studies have showed this berry is also anti-aging, a cup of blueberries a day enables people to be 5-6% better at motor skills.
How to Eat
The fruit can be eaten fresh or mixed with other fruits to make delicious fruit salad, cooked deserts, muffins, cakes, ice-cream, sauce, yogurt, preserves & chutney.
Expected Yield
200gm in the first year growth doubling each year until fully grown, producing up to 8-10kg of delicious fruit. Cross pollination improves yield.
Generic Fruiting Time
| J | F | M | A | M | J | J | A | S | O | N | D |
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Growing
Sun
Plant in full sun though they will handle some afternoon shade.
Wind
Not affected by wind.
Climate
Blueberries are cold hardy and require chilling hours to set fruit and leaves. Chilling hours required for Rabbiteye varieties are sufficient in Auckland. Blueberries can be grown from Kaitaia to Invercargill.
Soil
Blueberries like acid soils thou Rabbiteyes are not too fussy. Blueberries have a shallow fibrous root system and thrive on moist, free draining acid soils with a high proportion of organic matter. Well drained peat soils are ideal, but mineral soils such as sandy or silt loams are also suitable, provided peat moss is added during planting and on a regular basis afterwards. Heavy clay soils which crack in summer and become waterlogged in winter are generally not suitable for blueberries unless heavily amended with organic matter and sand and gypsum. A raised bed will help with drainage. Mulch blueberries with a 15-20cm mulch of bark, acid compost, or sawdust over the roots to conserve moisture, prevent weeds and over time increase the soil organic matter. Grass clippings are okay if supplemented with some fibrous organic matter such as sawdust.
Fertiliser
Blueberries require only light applications of nitrogen, phosphate, and potash in the first three or four years. Continual addition of compost and mulch will generally supply their needs. Slow-release complete nutrient fertilisers can be used at the beginning of the growing season.
Pruning
Flower buds are formed on the outer parts of the current season's growth in late summer as the stems mature. Fruit is borne on last season's wood, and vigorous wood bears the largest fruit. Minimum pruning consists of removal of dead or diseased wood, weak growth, and old twiggy branches. After 4-5 years come of the oldest branches may need cutting back to the crown to encourage vigorous new growth. Pruning to shape may be done at any time but if heavy pruning is best done in winter dormancy.
Pests
Blueberry plants are naturally resistant to many common pests and diseases. Phytophthora root rot is the most serious disease and can be a problem on waterlogged soils; ensure you plant in ground with good drainage. Birds can cause serious damage to fruit so netting is advised.
Hardiness
-4
Special Conditions