- 7.5% aluminum + 13.5% sulfurSupplies aluminum and acidifies the root zone to support its availability.
- Measured applicationFive tablets treat a potted or landscape hydrangea; use 3 for an acid-loving shrub on alkaline soil.
- For suitable hydrangeasOnly bigleaf and mountain hydrangeas can be turned blue. This treatment does not turn white, panicle, oakleaf or smooth hydrangeas blue.
- A companion soil treatmentUse alongside a separate plant food. Re-apply the soil treatment every 4 months.
Products Aluminum Sulfate
Aluminum Sulfate
A measured soil-acidifying tablet for blue blooms on bigleaf and mountain hydrangeas. Supplies aluminum and sulfur alongside a separate plant food.
Stock TABCOTE How to apply20 × 5 g tablets · 100 g pouch · Treats up to 4 hydrangeas at 5 tablets each
- Soil acidifier7.5% Al · 13.5% S
- 4 monthsreapplication interval
- 5 / hydrangeapotted or landscape
Why this formula works.
Gradual aluminum supply and soil acidification for the hydrangea types that can turn blue.
Best for: Bigleaf and mountain hydrangeas for bluing, and acid-loving ornamental shrubs on alkaline soil. Not for edible plants.
Not for edible plants. Only bigleaf and mountain hydrangeas can be turned blue. Use a separate hydrangea plant food.
How much to use.
Use 5 tablets per potted or landscape hydrangea, or 3 per acid-loving shrub on alkaline soil. This is a soil treatment, used alongside a separate plant food.
| Your planting | Recommended dose |
|---|---|
| Potted hydrangeaPer plant | 5 tablets |
| Landscape hydrangeaPer plant | 5 tablets |
| Acid-loving shrub on alkaline soilPer shrub | 3 tablets |
Re-apply every 4 months. One pouch treats up to 4 hydrangeas at the 5-tablet rate.
How to apply.
Soil treatment. Repeat every 4 months.
- Step 1
Select your tablets
Use 5 per potted or landscape hydrangea, or 3 per acid-loving shrub on alkaline soil.
- Step 2
Place in the soil
Place 2 inches deep and 2 inches from the stem. Space tablets around the plant.
- Step 3
Cover and water
Cover completely with soil and water. Re-apply every 4 months.
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Discuss the range, starter kits, and availability with our team.
Growing something else?
Explore all formulasNot for edible plants. Only bigleaf and mountain hydrangeas can be turned blue. Keep away from children and pets. Follow the instructions on your product pouch.