Grapes reward precise feeding. Match the nutrient to the stage — from foundation pruning to harvest — for bigger bunches and better sugar.
Feed to the growth stage
After foundation pruning, push nitrogen and phosphorus for shoot and root growth. At flowering, shift to boron, zinc and calcium for set. During berry development, potassium takes over for size, colour and Brix.
Grape Feeding Guide
| Stage | Focus nutrients | Typical products |
|---|---|---|
| Vegetative | N + P + Zn | UAN 32, 10-34-00, Zinc |
| Flowering | Ca + B + Mg | Calcium Nitrate, Mg Nitrate |
| Berry growth | High K | K-URJA, 00-24-24 |
👉 Pro tip: Avoid heavy nitrogen after fruit set — it delays ripening and softens berries.
Key Takeaways
- Feed to the stage, not the calendar
- Potassium rules the ripening phase
- Calcium & boron improve set
- Chloride-free K protects quality
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Disclaimer: doses are general guidelines. Always adjust to crop, soil test, growth stage and local agronomist advice.