Seacliff Organics Balanced Tomato Fertiliser

Seacliff Organics Balanced Tomato Fertiliser

A tomato fertiliser blend with phosphorus, potassium, calcium and magnesium for fruiting plants, plus trace elements and humic substances. It suits tomatoes and other fruiting vegetables in beds, large pots and containers.

At a glance

• Type: fertiliser blend (dry, for tomatoes and fruiting vegetables)
• Analysis: NPK = 3.3 - 5.8 - 8.4 (N, P₂O₅, K₂O); elemental 3.3 - 2.5 - 7.0, calculated from the recipe
• Also supplies: about 11.6% calcium, 5.2% sulphur and 1.2% magnesium
• Use for: tomatoes, peppers and other fruiting vegetables, in beds, large pots and containers
• Rate: 3 to 4 cups per 5 square metres before planting, mixed into the top 16 to 20 cm of soil

What it is

A dry blend made by Seacliff Organics in Otago. Ingredients: amino acids, fish meal, BioPhos, gypsum, magnesium sulphate, sulphate of potash, Acadian kelp, fulvic acid, humic acid, K-Humate, trace minerals, basalt rock dust and potassium silicate.

What it does

• Potassium and phosphorus for fruit set and fruit fill, at a higher share than nitrogen so the plant is not pushed into leaf.
• Calcium from BioPhos and gypsum. Blossom end rot in tomatoes is a calcium disorder in the fruit; a steady calcium supply is one part of avoiding it, and even watering is the other, because calcium moves with water.
• Magnesium and sulphur from magnesium sulphate and gypsum. Magnesium sits at the centre of chlorophyll.
• Trace elements and humic substances from the chelated trace minerals, K-Humate and kelp.

Analysis

Typical analysis, % by weight:

• Nitrogen (N) 3.3%
• Phosphorus 5.8% as P₂O₅ (2.5% elemental P)
• Potassium 8.4% as K₂O (7.0% elemental K)
• Calcium (Ca) 11.6%
• Magnesium (Mg) 1.2%
• Sulphur (S) 5.2%
• Iron (Fe) 0.21%
• Manganese (Mn) 0.10%
• Zinc (Zn) 600 mg/kg
• Copper (Cu) 300 mg/kg
• Boron (B) 300 mg/kg
• Molybdenum (Mo) 100 mg/kg
• Sodium (Na) 0.13%

Calculated from the batch recipe sheet and the ingredient certificates on file (14 October 2026). A laboratory analysis of the finished blend will differ a little from these figures.

How to use

• Incorporate into soil, or top dress through the growing season. Avoid over application and start low.
• New vegetable plantings: before planting seeds or vegetables, use 3 to 4 cups for every 5 square metres of garden. Mix thoroughly into the top 16 to 20 cm of soil.
• Established vegetable gardens: feed every 4 to 6 weeks as needed through the growing season. Use 2 cups for every 5 square metres, or 1 tablespoon per individual plant. Lightly mix into the soil surface and water thoroughly.
• Large plants: feed every 30 days as needed through the growing season. Use 2 to 4 tablespoons per plant depending on size, applied to an area 30 to 40 cm wide around the main stem. Mix lightly with soil and water thoroughly.
• Container grown: apply 1 tablespoon for every 16 cm of pot diameter every 30 days or as needed. Spread evenly over the soil surface, mix lightly into it, and water.

Learn more in fifteen seconds

• Calcium: what it does
• Potassium: what it does
• More isn't better

Handling and storage

• Wear a mask to avoid inhaling particles and open in a well ventilated area.
• Wear gloves and eye protection, and wash hands after use.
• Once opened, keep sealed and dry.