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.

CompleteGrow Citrus Fertiliser – Use during early spring and summer when the tree is actively growing. This potassium-rich formula supports flowering, fruit set, and promotes lush foliage.
Cal-Mag Hydroponic Nutrients Fertiliser – Use as an additional supplement, especially during fruiting stages, to provide calcium and magnesium, which are crucial for strong cell walls and to prevent 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:

CompleteGrow Citrus Fertiliser – Apply in early growth to support lush foliage and healthy flowering.
Cal-Mag Hydroponic Nutrients Fertiliser – Supplement your feeding during fruit development to ensure larger, better-quality fruit and prevent issues like blossom end rot.

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 Citrus Trees

Citrus trees are heavy feeders and require consistent fertilisation throughout their growth cycle to produce vibrant foliage, healthy flowers, and juicy fruit.

CompleteGrow Citrus Fertiliser – Apply in early spring and throughout the growing season to support foliage growth, flowering, and fruit production. Feed every 2–3 weeks during the growing season.
Cal-Mag Hydroponic Nutrients Fertiliser – Use during the fruiting stage to boost calcium and magnesium levels, which are essential for fruit development and preventing issues like blossom end rot.

Adjust application strength based on plant size and growth stage. Always water fertiliser in well to ensure proper absorption.

Watering, Pruning & Mulching Tips for Citrus Trees

Water deeply 2–3 times a week, ensuring the soil drains well. Avoid over-watering to prevent root rot.
Prune dead or damaged branches and lightly trim the tree to encourage healthy growth and proper airflow.
Apply mulch around the base to retain moisture, prevent weeds, and protect roots from temperature fluctuations.

Troubleshooting Common Citrus Tree Issues

Yellowing Leaves: This can be caused by nutrient deficiencies, especially nitrogen or iron. Ensure proper feeding with CompleteGrow Citrus Fertiliser to resolve this issue. Blossom End Rot: A calcium deficiency often caused by inconsistent watering. Prevent it by using Cal-Mag Hydroponic Fertiliser. Pests: Citrus trees can be vulnerable to aphids, mealybugs, and spider mites. Use organic insecticidal soap or neem oil to prevent infestations.

Harvesting Citrus Fruit

Citrus fruits typically ripen 9–12 months after planting. Meyer lemons and other citrus varieties should be allowed to fully ripen on the tree for the best flavor. Harvest fruits when they are brightly colored, and avoid picking them too early. In warmer climates, you may choose to pick them slightly early to avoid pests, allowing them to ripen indoors.

The Complete Grow Approach to Citrus Tree Success

With just two reliable, high-performance formulas, you can nurture your citrus trees from seedling to harvest:

CompleteGrow Citrus Fertiliser – Ideal for supporting foliage growth, flowering, and fruit production throughout the growing season.
Cal-Mag Hydroponic Nutrients Fertiliser – Used to strengthen fruit, prevent blossom end rot, and ensure overall plant health during fruiting.

Explore our full fertiliser collection to keep your citrus trees thriving through every season.