Blueberry
Vaccinium corymbosum
Also known asHighbush blueberry (V. corymbosum) · Lowbush blueberry (V. angustifolium, wild) · Rabbiteye blueberry (V. virgatum, Southern) · Bilberry (V. myrtillus, distinct European species)
Environment
The bounded range this crop tolerates.
Climate and zones
- USDA zones
- 3–10 (winter low around -40°C)
- Frost
- very hardy (survives deep cold)
- Season
- cool (spring/fall)
Growing systems
Root mass: heavy. Thin-channel systems can't hold this crop.
Growing media
| Medium | pH effect | Retention | Bacterial surface |
|---|---|---|---|
| Soil-based mix (Potting soil) | varies | high | high |
Nutrient demand by stage
NPK ratios are relative weights. EC targets shift through the plant's life.
| Stage | N | P | K | EC (mS/cm) |
|---|---|---|---|---|
| seedling | 2 | 1 | 1 | 0.8 |
| vegetative | 2 | 1 | 2 | 1 |
| flowering | 1 | 1 | 2 | 1.2 |
| fruiting | 1 | 1 | 2 | 1.4 |
Aquaponics suitability
Not recommended
Fish waste alone doesn't supply enough of what this crop demands. Grows in hybrid systems with supplemental dosing, but expect active management.
Care notes
Feasible in large-container hydroponics with careful pH control. The make-or-break requirement is acidity: pH 4.5 to 5.5, well below most hydroponic crops. Use a pine-bark or peat-based medium or a coir/perlite mix acidified with sulfuric or phosphoric acid. Hold EC around 0.8-1.4 mS/cm, since blueberries are light feeders and over-fertilising burns the roots. Unusually, they prefer ammoniacal nitrogen over nitrate, which suits their acidic-soil biology. Grow at 15–25°C; most varieties need winter chill, roughly 600 to 1,000 hours below 7°C, outdoors. Give high light, 18-28 mol/m2/day. Plants start bearing at two to three years from nursery stock, and pairing two varieties for cross-pollination improves berry size and yield. A mature bush gives 2–5 kg a year. The acidic requirement makes blueberries incompatible with most aquaponic fish loops, which run pH 6.5-7.5, but separate containers fed pH-adjusted effluent can work, and the high retail value justifies the effort.
Notable varieties
| Cultivar | Type | Origin | Days | Notes |
|---|---|---|---|---|
| Bluecrop | open pollinated | 730 | Northern highbush, USDA zones 4-7. The most-planted commercial blueberry worldwide. Reliable mid-season harvest, good flavor, productive. The variety most home garden 'blueberries' actually are. | |
| Duke | open pollinated | 700 | Northern highbush, very early. Cold-tolerant blossoms (handles late frosts that damage other varieties). Plant Duke + Bluecrop for staggered harvest. | |
| Pink Lemonade | hybrid | USDA, 2007 | 730 | Pink-fruited hybrid (rabbiteye × highbush). Productive in zones 4-9; the widest range of any cultivated blueberry. Novelty value plus actual reliability. |
| Tifblue (Rabbiteye) | open pollinated | USDA / U. of Georgia, 1955 | 730 | Rabbiteye type, zones 7-9. The most-planted Southern US blueberry. Heat and humidity tolerant where Northern highbush varieties fail. Larger, more vigorous plants (2.5-3 m vs 1.5 m highbush). |
| Top Hat | open pollinated | 730 | Dwarf lowbush variety, 50-60 cm tall, container-suited. Self-fertile. The blueberry to grow on a patio or in a small space. |