Best Fertilizer for Citrus : Complete Guide to Growth, Feeding & Yield

Citrus Plants

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Feeding Citrus Trees: What to Use and When

Citrus trees are heavy feeders. They need consistent nutrition throughout the growing season to maintain leaf health and maximise fruit quality.

NPK 20-20-20 – Use during early spring and summer when the tree is actively growing. This balanced fertiliser encourages strong leaf growth and helps support flowering and fruit set.
NPK 4-18-38 + Cal-Mag – Apply from mid-spring through autumn to boost fruit development, strengthen cell walls, and prevent common issues like fruit drop and splitting.

Feed every 2–3 weeks during active growth. For potted citrus, dilute to half-strength and feed monthly.

The Complete Grow Approach to Feeding Citrus

With just two high-performance formulas, Complete Grow gives you everything you need to feed citrus trees all year round:

NPK 20-20-20 – Apply in early growth to support lush foliage and healthy flowering.
NPK 4-18-38 + Cal-Mag – Feed from flowering through harvest to support larger, better-tasting fruit and reduce fruit loss.

Explore our full fertiliser collection to keep your lemon, lime, or mandarin tree thriving with every season.

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Feeding Schedule for Healthy, Productive Plants

Tomatoes are heavy feeders. Regular fertilising throughout the growing cycle leads to stronger plants, better flowering, and more flavourful fruit.

NPK 20-20-20 – Begin using at seedling stage and continue through vegetative growth. Feed every 1–2 weeks.
Advanced NPK 4-18-38 + Cal-Mag – Switch when flowering starts to boost fruit set, size, and flavour while preventing calcium-related issues like blossom end rot.

Adjust application strength depending on plant size and growth stage. Always water fertiliser in well.

Watering, Pruning & Mulching Tips

Water deeply 2–3 times a week, avoiding overhead watering to prevent fungal issues.
Prune side shoots and lower leaves to promote airflow and fruit production.
Apply mulch around the base to retain moisture and suppress weeds.

Troubleshooting Common Tomato Issues

Blossom end rot: Caused by inconsistent watering or calcium deficiency. Prevent it with our 4-18-38 + Cal-Mag. Fruit fly: Protect fruit with mesh bags or harvest early and ripen indoors. Target spot: Look for brown spots and leaf yellowing. Prune lower leaves and rotate crops each year.

Harvesting Tips

Tomatoes usually mature 12–20 weeks after sowing. For best flavour, allow them to fully ripen on the vine. In hot climates, pick slightly early to ripen indoors and avoid pest damage. Continue feeding and pruning until the plant slows down with cooler weather.

The Complete Grow Approach to Tomato Success

With just two reliable, high-performance formulas, you can take your tomatoes from seedling to harvest:

NPK 20-20-20 – Balanced, highly soluble and ideal for growth and early development.
NPK 4-18-38 + Cal-Mag – Designed for flowering, fruiting, and overall plant health.