Best Fertilisers for Eggplants (Aubergines): Boost Size, Yield & Flavour

Want to grow lush, high-yielding eggplants? It all starts with the right feeding program. Eggplants (also known as aubergines) are nutrient-hungry, fruiting vegetables that need balanced fertilisers and steady nutrition from transplant to harvest. Whether you’re growing in a backyard bed, large container, or small market garden, choosing a fertiliser that supports each stage of growth is essential.

At CompleteGrow, we specialise in high-performance chemical fertilisers made for Australian growing conditions. No filler, no fluff—just concentrated NPK blends and trace elements that help your eggplants thrive from seedling to harvest.

1. Eggplant Growing Needs: What Makes Them Thrive?

Eggplants are heat-loving, deep-rooted vegetables in the Solanaceae family (which includes tomatoes and capsicum). Their nutritional needs shift through the season:

Early growth: Needs high nitrogen and phosphorus for leafy growth and root development.
Flowering: Requires phosphorus and potassium to support bloom strength and fruit set.
Fruiting: Relies on potassium, calcium, and magnesium to size up fruit and avoid deformities or end rot.

Environmental needs:

Soil pH: 6.0 to 6.8 is ideal for nutrient uptake.
Drainage: Use a free-draining mix or well-drained soil enriched with chemical fertiliser. Avoid waterlogging.
Sunlight: At least 6–8 hours of direct sun per day.
Spacing: Leave 45–60 cm between plants to allow air movement and reduce disease risk.

Eggplants take 10–12 weeks from transplant to harvest. Their long growing season means they need consistent feeding—especially during flowering and fruit swelling when nutrient demand spikes.

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2. The Best Fertilisers for Eggplants – From the CompleteGrow Range

Every CompleteGrow product is scientifically formulated and 100% chemical-based—pH-balanced, fast-absorbing, and free from organic matter. Here’s how to feed your eggplants at every stage using our top fertilisers:

All Purpose NPK 20-20-20

This balanced liquid concentrate is perfect during the first 4–6 weeks after transplant. It contains equal parts nitrogen, phosphorus, and potassium, plus essential trace elements like iron, manganese, and zinc for rapid vegetative growth.

Use: 4–5 ml per litre of water, once per week.
When: From transplant until the first sign of flower buds.
Why: Encourages strong stems, broad foliage, and deep root systems.

Cal-Mag Liquid Fertiliser

Eggplants are especially sensitive to calcium and magnesium deficiencies, which often show as blossom-end rot or leaf curl. Our Cal-Mag solution delivers fast-absorbing calcium and magnesium for stronger stems and resilient fruit.

Use: Every 2–3 weeks as a supplement during flowering and fruiting.
Why: Prevents fruit defects and supports optimal nutrient balance.

All CompleteGrow fertilisers are suitable for use in soil, coco coir, and hydroponic systems. They’re also pH-buffered, meaning they stabilise your solution within the ideal range automatically.

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3. Eggplant Fertiliser Schedule & Grower’s Guide

Applying the right fertiliser at the right time is critical. Below is a weekly schedule tailored for eggplants using CompleteGrow’s high-performance formulas:

Weeks 1–3: Establishment Phase

Fertiliser: All Purpose NPK 20-20-20
Frequency: Once per week
Goal: Encourage foliage growth and root development

Weeks 4–7: Pre-Flowering Phase

Fertiliser: Continue with All Purpose NPK
Frequency: Every 5–7 days
Tip: Begin adding Cal-Mag every 2 weeks

Flowering & Fruiting (Week 8+)

Fertiliser: Switch to PK Booster + Cal-Mag
Frequency: Every 7–10 days (alternate with Cal-Mag)
Goal: Maximise flower retention, fruit size, and flavour

Pro Grower Tips:

Always fertilise in early morning or late afternoon to reduce evaporation.
Use clean water and mix fertiliser fresh each time.
Flush containers with plain water every 4–6 weeks to prevent salt buildup.
Stake plants early to support heavy fruiting branches.

With a consistent feeding schedule and CompleteGrow’s premium range of fertilisers, your eggplants will produce firm, glossy, flavour-packed fruit all season long. Whether you grow in beds or pots, feeding the right way is the difference between average and abundant.