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
Out of stock at your selected pickup location? If your order is being picked up in Newmarket or Barrie, we’ll automatically transfer available inventory between those two stores, so everything is handled for you.
1175 Stellar Drive, Unit #5
Newmarket, ON L3Y 7B8
106 Saunders Road, Unit #2A
Barrie, ON L4N 9A8
719 Krosno Boulevard
Pickering, ON L1W 1G4
915 McLeod Avenue, Unit #4
Winnipeg, MB R2G 0Y4
GardenPRO Perennial & Vine 8-12-16 is a granular fertilizer for perennials and vines, designed to provide organic-based nutrition that supports vigorous growth and abundant flowering. This granular plant food is made for productive perennials and climbing plants where steady, season-long performance and strong display are the priority.
Perennial plantings often need a fertilizer that keeps foliage looking full while still supporting bloom potential, especially once plants are established and returning year after year. GardenPRO Perennial & Vine 8-12-16 is positioned for all herbaceous perennials and vines, making it an easy fit for mixed borders where flowering perennials share space with vining ornamentals. It’s also a practical choice for gardeners growing clematis, where consistent nutrition helps support a strong show without overcomplicating your routine.
This formula is described as enriched with sulfur, iron, zinc, and granular kelp, giving it a clear “extra support” angle beyond basic NPK. Those additions are included for benefits like supporting root development, stimulating photosynthesis, and improving plant resistance to harsh conditions. In real garden terms, that points to sturdier growth habits, better-looking foliage, and more reliable performance when weather and outdoor conditions aren’t ideal.
The facts layer stays simple and shopper-friendly. The stated analysis is 8-12-16, and the key inputs highlighted are sulfur, iron, zinc, and granular kelp. Together, they reinforce this product’s role as an organic-based perennial and vine fertilizer that’s focused on both plant vigor and flowering performance, rather than a specialty, single-use amendment.
GardenPRO Perennial & Vine 8-12-16 is a good fit for gardeners who want a granular fertilizer for herbaceous perennials and vines in in-ground beds or pots, with organic-based nutrition and added inputs that support root development, photosynthesis, and plant resilience for strong seasonal colour and growth.
Feed garden perennials for steady growth and strong flowering through the season.
Apply: Mix into the soil at 1 kg (2.2 lb) per 5 m² (50 sq. ft.).
Water in: Water thoroughly after applying.
Repeat feeding: Reapply every 6 weeks until early August.
Use around the root zone to support vigorous vine growth and bloom production.
New plants: Mix into the soil 227 g (1/2 lb) per plant.
Mature plants: Mix into the soil 454 g (1 lb) per plant.
Water in: Water thoroughly after applying.
Repeat feeding: Reapply every 6 weeks until early August.
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.
| Total Nitrogen (N) | 8.0% |
|---|---|
| Available Phosphoric Acid (P2O5) | 12.0% |
| Soluble Potash (K2O) | 16.0% |
| Calcium (Ca) | 1.0% |
| Total Iron (Fe) | 0.1% |
| Zinc (Zn) | 0.1% |
| Organic Matter | 15.0% |
Available phosphoric acid provides a fast-absorbing form of phosphorus that fuels root growth, energy transfer, and strong flowering. It becomes part of the plant’s total available phosphate supply, but the two terms are not the same—available phosphoric acid is one source of phosphorus, while available phosphate refers to the entire pool of plant-available phosphorus overall.
Calcium is important because it builds and stabilizes plant cells as they form, acting as the structural support that keeps new growth strong and functional. Unlike other nutrients that drive color or speed of growth, calcium’s role is unique because it controls cell wall strength and membrane stability, making it essential for healthy roots, shoots, and long-term plant resilience rather than quick visual results.
Feather meal supplies slow-release nitrogen that supports steady green growth over time, especially once roots and soil microbes are active. It’s unique because plants can’t use it immediately the way fast nitrogen sources work, so it’s best for building a long-term baseline rather than fixing a sudden deficiency overnight.
Organic matter is important because it stabilizes the root zone by holding water, storing nutrients, and improving airflow, which helps plants absorb what they need more consistently; it’s unique because it supports the whole growing environment instead of acting like a single nutrient with one job.
Soluble potash (K2O) is important because it helps plants control water use, move sugars to new growth and fruit, and build stronger, higher-quality structure under stress. It’s unique from many other nutrients because it acts more like a regulator and transport helper than a direct “building material,” so the biggest benefits show up as steadier growth, stronger stems, and better finishing instead of just bigger leaves.
Total iron (Fe) matters because iron supports chlorophyll development and plant energy systems, keeping new growth green and vigorous; it’s unique from many other nutrients because iron deficiency usually shows up first in young leaves even when older leaves stay green, since iron doesn’t easily move within the plant.
Total Nitrogen is important because it directly drives leafy growth, chlorophyll production, and overall growth speed, which sets the pace for the entire plant. It’s unique because the “total” number can include different nitrogen forms that behave differently in the root zone, meaning the same total amount can produce very different results depending on the nitrogen type and plant stage.
Zinc is important because it powers key enzymes and helps regulate growth hormones, which directly controls healthy new leaves, normal internode spacing, and strong growth tips; it’s unique compared to many other micronutrients because zinc problems often show up as distorted, undersized new growth and stunting, not just simple leaf yellowing.
Because iron oxide is often poorly soluble, the iron can be present but locked up, especially when the root zone is too alkaline or roots are stressed. It’s important because iron drives chlorophyll and healthy new growth, and it’s unique from more readily available iron forms since it depends far more on root-zone conditions to become usable.
Kelp meal supports balanced growth and stronger roots by gently enhancing root-zone biology and helping plants handle stress more smoothly than fast-acting inputs, making it unique as a steady “support” amendment rather than a quick nutrient fix.
Yes, when soil is too acidic, limestone can help plants grow better by gently raising pH and supplying calcium so roots can absorb nutrients more smoothly. It’s unique because it fixes the root-zone chemistry itself, which can solve several “mystery deficiencies” at once, but if used when pH is already high it can trigger micronutrient lockout instead.
Monoammonium phosphate feeds roots with phosphate for energy transfer and ammonium nitrogen for fast tissue building, which is why it can boost early rooting and growth more quickly than many other phosphorus sources. It’s unique because the ammonium portion can change root-zone pH and nutrient availability, so using it correctly supports roots, but overusing it can trigger imbalances that look like other deficiencies.
Muriate of potash supplies potassium to help plants manage water, move sugars, and build stronger growth, which is especially important when plants are flowering or fruiting. It’s unique because it delivers potassium in a very concentrated form while also adding chloride, so it can fix low potassium fast but needs care to avoid salt buildup and imbalance.
Yes, but it works best as a slow, soil-building phosphorus source that supports steady root development and smoother transitions into flowering over time. Its uniqueness is that it feeds gently and gradually, helping reduce sudden phosphorus swings compared with fast-acting sources that can cause lockouts or imbalances when overapplied.
Urea can burn plants because it must convert in the root zone, and that conversion can create a concentrated, temporarily harsh micro-zone that stresses roots, especially if urea is piled, left on the surface, or not watered in. That conversion step is what makes urea unique compared with nitrogen forms that are already plant-available, so correct placement and moisture are critical.
Zinc sulfate supplies plant-available zinc to quickly correct zinc deficiency, helping restore normal new leaf expansion and steady growth at the tips. It’s important because zinc is needed in tiny amounts but strongly affects growth regulation, and zinc sulfate is unique for its predictable solubility and fast correction compared to slower zinc sources.

1175 Stellar Drive, Unit #5
Newmarket, ON L3Y 7B8
106 Saunders Road, Unit #2A
Barrie, ON L4N 9A8
719 Krosno Boulevard
Pickering, ON L1W 1G4
915 McLeod Avenue, Unit #4
Winnipeg, MB R2G 0Y4