Newmarket, Ontario (Head Office)
1175 Stellar Drive, Unit #5
Newmarket, ON L3Y 7B8
- Mon10:00am–6:00pm
- Tue10:00am–6:00pm
- Wed10:00am–6:00pm
- Thu10:00am–6:00pm
- Fri10:00am–6:00pm
- Sat10:00am–4:00pm
- SunClosed
$0.00 CAD
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GardenPRO Superstarter 10-52-10 Water Soluble is a water soluble starter fertilizer for seedlings and bedding plants, designed to support strong, rapid root growth at transplant time. This water soluble plant fertilizer is made for early-stage establishment when rooting speed and confidence matter most.
If you’re moving young plants into their next home—whether that’s a garden bed, a larger container, or a landscape planting—this formula keeps the focus on the part of the plant that sets everything else up for success: the roots. GardenPRO positions Superstarter as high in phosphorus for strong and rapid root growth, which makes it a natural fit when your goal is quicker rooting and steadier early development rather than general, all-season feeding.
Because it’s a water soluble fertilizer, it dissolves easily in water and stays simple to work with in everyday gardening routines. Shoppers who prefer soluble plant nutrition often choose this format for its clean, predictable handling and fast preparation, especially during busy planting weeks when many seedlings and bedding plants are moving at once. Superstarter is built around that convenience while keeping its purpose tightly targeted to starter-stage performance.
The benefits are clear and plant-focused. High phosphorus starter nutrition supports strong root growth, helps promote rapid root development, and supports early establishment for young plants during transplanting. That early push can make a noticeable difference in how quickly plants settle in and begin building new growth above the soil line, especially for bedding plants that are expected to perform quickly once planted out.
The facts layer is compact: the stated NPK is 10-52-10, and the product is a water soluble starter formulation positioned around high phosphorus support for rooting. GardenPRO Superstarter 10-52-10 Water Soluble is a good fit for gardeners who want a dissolves-easily water soluble starter fertilizer designed for transplanting seedlings or bedding plants, with a simple, root-focused purpose and a clear early-stage role in the garden.
Use GardenPRO Superstarter when moving seedlings or bedding plants into their new home to support strong early establishment.
Mix rate: Dissolve 15 mL (1 tbsp.) in 4 L of water.
Apply per plant: Use about 250 mL (1 cup) of the mixed solution per plant.
When to use: Apply at transplanting (right after planting in the new location).
In hot weather, use half the recommended rate (mix at 50% strength) to keep feeding gentle on stressed plants.
Warning – Important Safety Information
This product may cause mild skin irritation and eye irritation. Avoid unnecessary contact with skin, eyes, and clothing. Use only as directed.
General safety precautions
Read and follow all instructions on the product label and any accompanying documentation before use. Keep out of reach of children and pets. Do not ingest. Avoid breathing vapours, mist, or dust that may be generated during handling or use.
Wear appropriate personal protective equipment (PPE), such as protective gloves, long sleeves, long pants and closed-toe footwear. When there is a risk of splashing or airborne particles, use safety glasses or other suitable eye and face protection.
First aid – skin contact
IF ON SKIN OR HAIR: Remove contaminated clothing immediately. Rinse skin with clean water for several minutes, then wash with mild soap and water. If irritation or redness develops and persists, seek medical attention. Wash contaminated clothing before reuse.
First aid – eye contact
IF IN EYES: Rinse cautiously with clean water for several minutes, keeping eyelids open. Remove contact lenses if present and easy to do. Continue rinsing. If irritation persists, obtain medical advice.
First aid – ingestion and inhalation
IF SWALLOWED: Rinse mouth thoroughly with water. Do not induce vomiting unless instructed by a medical professional. Seek medical attention if you feel unwell.
IF INHALED: Move the person to fresh air and keep them comfortable for breathing. If coughing, breathing difficulty, dizziness or other symptoms occur, seek medical assistance.
Storage and handling
Store this product in its original closed container, in a cool, dry and well-ventilated area. Protect from extreme temperatures and direct sunlight. Keep container tightly sealed when not in use.
Avoid release to drains, natural waterways or outdoor soil. Dispose of unused product and empty containers in accordance with local regulations and the directions on the label.
Important: If medical advice is needed, keep the product label or container available. Always follow the specific instructions and safety recommendations provided by the manufacturer. This safety notice is intended as general guidance and does not replace official label directions or documentation.

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