Jack's Classic Hydrangea Blue 7-3-3 is a specialized, water-soluble fertilizer formulated to enhance and maintain vibrant blue hydrangea blooms while promoting lush green foliage and healthy plant growth. Designed specifically for blue and pink hydrangea varieties, this professional-grade formula combines balanced nutrition with aluminum sulfate to help acidify soil and encourage rich blue flower coloration.
Ideal for hydrangeas growing in alkaline soils or near concrete foundations where soil pH often rises, this formula helps create the acidic conditions necessary for optimal blue bloom development in compatible hydrangea varieties.
Whether used in landscape beds, foundation plantings, or container gardens, Hydrangea Blue delivers targeted nutrition and soil conditioning for healthier plants and more vibrant blooms.
Key Features & Benefits
- Specialized 7-3-3 water-soluble fertilizer for hydrangeas
- Helps enhance and maintain vibrant blue flower coloration
- Contains 50% aluminum sulfate to acidify soil
- Promotes lush green foliage and healthy plant growth
- Ideal for alkaline soils and areas near concrete foundations
- Includes essential micronutrients for balanced nutrition
- Supports healthy roots and overall plant vigor
- Can be applied as both a root drench and foliar spray
- 100% water-soluble and easy to mix
- Excellent for landscape beds, containers, and ornamental gardens
Guaranteed Analysis
- 7% Nitrogen
- 3% Available Phosphate
- 3% Soluble Potash
Enhanced with aluminum sulfate and essential micronutrients to support healthy foliage and optimal flower coloration.
Ideal For
- Blue hydrangeas
- Pink hydrangeas capable of blue coloration
- Mophead hydrangeas
- Lacecap hydrangeas
- Nikko Blue hydrangeas
- Blue Bird hydrangeas
- Merritt’s Supreme hydrangeas
- Foundation plantings
- Ornamental garden beds
- Flowering landscape shrubs
Designed to Promote Blue Hydrangea Blooms
Hydrangea flower color is heavily influenced by soil pH. In alkaline soils, blue hydrangea varieties often shift toward pink or faded blooms. Jack’s Classic Hydrangea Blue helps lower soil pH with aluminum sulfate, creating conditions that encourage stronger blue pigmentation in compatible hydrangea cultivars.
This makes it especially effective for gardens with naturally alkaline soil or planting areas near sidewalks, driveways, and concrete foundations that can raise soil pH over time.
Supports Healthy Green Foliage
In addition to improving bloom coloration, the balanced 7-3-3 nutrient profile supports healthy root systems, vigorous branching, and lush green foliage for fuller, healthier hydrangea plants throughout the growing season.
Flexible Feeding Applications
Hydrangea Blue can be applied directly to the root zone as a soil drench or sprayed onto foliage for fast nutrient uptake and improved feeding flexibility.
Important Note
This product is designed to enhance or maintain blue coloration in hydrangea varieties genetically capable of producing blue blooms. It will not change the color of naturally white hydrangea varieties.
