Garden Select for Blue Hydrangea Blossoms

Garden Select for Blue Hydrangea Blossoms is backed by the horticulturalists at Osmocote® Plant Food, so effectiveness, quality, and consistency are assured. The unique coating technology controls the release of the active ingredient, aluminum sulfate, for up to 3 months, thus ensuring its presence in the soil throughout the blossoming season.

For best results, apply before buds form and the hydrangea blossoms. Not available in Florida.

How do I know if my hydrangeas will turn blue?

Only hydrangeas of the Hydrangea Macrophylla, which includes Lacecap and Mopheads, and Hydrangea Serrata varieties can be manipulated to change flower color, and some cultivars of those varieties are more capable than others.

For other varieties such as: Endless Summer, Nikko Blue, Penny-Mac, Nantucket Nikko, Blue Danube, Blue Wave, Blauer Prinz, etc. it is best to check plant tags for type and color-change capability.

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Garden Select for Blue Hydrangeas

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Garden Select for Blue Hydrangea Blossoms

Available in 3lb. Bag


  • Scoop included
  • 1 scoopful = 3 tablespoons
  • 3-pound bag contains 33 scoopfuls or 100 tablespoons
  • Treats 15, 3-ft. hydrangeas, twice per year

Garden Select for Blue Hydrangea Blossoms

Guaranteed AnalysisF643
  • 13.3% Combined Sulfur (S)

Derived From: Polymer Coated Aluminum Sulfate *13.3% slow release sulfur(S) from polymer coated aluminum sulfate.

Guaranteed Analysis – Soil Amendment Ingredient:

Inert Ingredient (as a soil amendment)91.98%

Information regarding the contents and levels of metals in this product is available on the internet at


Performance guaranteed or your money back

If you are not satisfied, return the empty package to this address:

The Scotts Company
14111 Scottslawn Road
Marysville, OH 43041

Limit: One package per family

How does Garden Select for Blue Hydrangea Blossoms work?

Polymer coated prill with active ingredient, aluminum sulfate – Al2(SO4)3
Coating permits water to penetrate and dissolve active ingredient
Active ingredient is released with increase in soil temperature

How to apply Garden Select for Blue Hydrangea Blossoms.


Spread 1 scoopful or shake plant food onto soil


Mix into 1 -3 inches of soil


Reapply every 4 - 6 months*

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