Want bigger, sweeter tomatoes without synthetic fertilisers? The right organic fertiliser can dramatically improve your yield, soil health, and plant resilience—especially in Australian growing conditions.
After trialling six blends in our Wollongong test beds, two products stood out for unstoppable growth and fruit set: Ocean Grown Fish Hydrolysate and Nurture All – All-Purpose Craft Blend. Here’s the exact program we now recommend to every backyard grower.
Table of Contents
- Why Tomatoes Are Hungry Crops
- Fool-Proof Feeding Schedule
- Troubleshooting Nutrient Issues
- Special Tips for Pots & Grow-Bags
- FAQs
- Next reads for feeding tomatoes more effectively
If you want to grow tomatoes like they used to, here's the simplest ways to get results:
Why Tomatoes Are Hungry Crops
Tomatoes pump out kilos of fruit in a single season. Each truss is basically a nutrient dump, pulling nitrogen for leaf growth, phosphorus for roots and flowers, and calcium to stop blossom-end rot. Unless you replace what’s lost, yields nosedive and fruit quality suffers.
If you want to dial in not just the fertiliser but the foundation beneath it, our Soil for Tomato Plants Australia (DIY Mix + Proven Ratios) guide shows exactly how to build the microbial, calcium-rich base that makes every fertiliser application work 2× harder.
Organic fertilisers work with soil microbes instead of against them, building long-term fertility and flavour. That’s why every product in our Organic Garden Fertiliser Collection is free from synthetic salts.
Fool-Proof Feeding Schedule
|
Growth Stage |
Product & Rate |
How It Helps |
|---|---|---|
|
Seed-sowing & Seedling |
5 mL Fish Hydrolysate per L water every 7 days |
Amino acids jump-start root enzymes; low-heat processing keeps nutrients in a plant-available form. |
|
Transplant Week |
1 Tbsp Nurture All mixed into each planting hole |
Balanced N-P-K plus trace minerals buffer transplant shock and boost early flowering signals. |
|
Vegetative Push (Weeks 2-4) |
10 mL Fish Hydrolysate per L, soil-drench every 10 days |
Nitrogen and peptides drive lush canopy without chemical burn risk. |
|
First Flowers & Fruit-Set |
Side-dress ½ cup Nurture All per plant; water in with 15 mL Fish Hydrolysate per L |
Phosphorus, calcium and potassium set more trusses and tighten cell walls for crack-free skins. |
|
Heavy Fruit Load |
Continue 15 mL Fish Hydrolysate per L every 7 days until final harvest |
Keeps micronutrients flowing, improves flavour compounds, and stimulates microbial disease resistance. |
Pro tip: Hose-end sprayers make Fish Hydrolysate application a two-minute job—no lugging watering cans.
Troubleshooting Nutrient Issues
|
Symptom |
Likely Cause |
Quick Fix |
|---|---|---|
|
Yellow older leaves |
Nitrogen lag |
Foliar-spray 5 mL Fish Hydrolysate per L at dusk. |
|
Blossom-end rot spots |
Calcium imbalance |
Side-dress ¼ cup Nurture All; keep soil evenly moist. |
|
Purpling on leaf undersides |
Phosphorus shortage (cool soil) |
Drench 20 mL Fish Hydrolysate per L; add organic mulch to warm the root zone. |
|
Sparse flowering |
Excess nitrogen |
Pause Fish Hydrolysate for one cycle; add ½ cup Nurture All to rebalance N-P-K. |
Special Tips for Pots & Grow-Bags
Containers dry out fast and leach nutrients quicker than ground beds.
-
Mix 2 Tbsp Nurture All into every 10 L of potting mix before planting.
-
Feed 10 mL Fish Hydrolysate per L of irrigation water weekly.
-
Top-dress ¼ cup Nurture All every four weeks to recharge the mix.
FAQs
Is Fish Hydrolysate safe for seedlings?
Yes. Because it’s produced at low temperatures, the amino acids stay intact and won’t scorch tender roots.
How often should I fertilise tomatoes in winter?
Cut liquid feeds to fortnightly and keep Nurture All side-dresses light; cool temps slow uptake.
Can I use these products in hydroponics?
Fish Hydrolysate is compatible with most bio-hydro systems. Nurture All is soil-focused but works in coco if top-dressed and watered in.
Do organic fertilisers attract pests?
Not when used at the recommended rates. Any fishy aroma dissipates in minutes once watered in.
Ready to feed your tomatoes?
Explore the full Organic Garden Fertiliser range or grab our Tomato Starter Bundle featuring both Fish Hydrolysate and Nurture All—and watch your vines load up with flavour-packed fruit.
Next reads for feeding tomatoes more effectively
Want stronger growth and better fruit set? These guides will help you choose better natural inputs, match nutrients to tomato needs and build healthier soil for more reliable results.
- Natural Garden Fertilisers Australia Guide
- How to Choose the Right NPK Fertiliser Australia
- How to Measure Soil pH Australia
- Organic Gardening 101: Living Soil Aussie Guide
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