GARDENWISE Hydrangea Slow-Release Fertilizer 5 qt — 8-4-8 with Iron & Sulfur for Blue/Purple Blooms

GARDENWISE Slow Release Hydrangea Fertilizer is a 5 qt, balanced 8-4-8 formula with added iron and sulfur to acidify soil and support more vivid, healthier blooms for acid-loving shrubs.

Whether you grow hydrangeas on a patio or azaleas in a backyard border, this slow-release granular fertilizer supplies steady nutrition while modifying soil pH to favor blue and purple shades. The blend releases nutrients gradually over up to three months, minimizing frequent feeding and helping maintain consistent foliage health and flower production. It’s formulated for both container and in-ground use and is simple enough for beginner gardeners while offering reliable performance for experienced growers.

How does this fertilizer encourage bigger, brighter blooms?

The 8-4-8 N-P-K balance supplies the phosphorus and potassium needed for strong flower set and color intensity, while iron and sulfur help lower soil pH and improve nutrient availability for acid-loving plants. Slow-release granules feed roots steadily to avoid nutrient spikes that can stress plants.

• Balanced 8-4-8 nutrients for bloom development and plant vigor
• Iron and sulfur to support lower soil pH and color expression
• Slow-release matrix feeding up to three months

Can I use this on both indoor potted hydrangeas and outdoor garden shrubs?

Yes — the formula is suitable for containers and landscape beds. Apply according to package directions, taking care to not over-apply in small pots; regular watering helps activate the granules and distribute nutrients evenly.

• Safe for indoor and outdoor use when applied as directed
• Adjust amounts for container size versus in-ground plantings
• Water after application to start nutrient release and soil conditioning

How often should I apply it, and how quickly will I see results?

Because it’s a slow-release product, one application typically feeds plants for up to three months, reducing seasonal re-feeding. Visual improvements in leaf color and flower quality may be noticeable within a few weeks as nutrients become available and soil acidity adjusts.

• Feeds up to three months—often a single spring application per season
• Improved leaf vigor and bloom quality within weeks
• Reapply according to plant needs and seasonal growth cycles

Is this suitable for other acid-loving plants besides hydrangeas?

Yes, it works well for azaleas, camellias, rhododendrons, and magnolias that prefer slightly acidic soils. Use the same careful, measured application to avoid over-fertilizing and to maintain stable soil conditions for these species.

• Recommended for azaleas, camellias, magnolias, and similar shrubs
• Helps maintain acidic soil conditions that these plants require
• Apply based on plant size and soil test recommendations

Who is this for: Home gardeners, landscapers, and container growers who want an easy-to-use fertilizer that promotes consistent flowering and supports acid-preferring shrubs. Choose this 5 qt GARDENWISE product if you prefer fewer feedings, measurable soil acidification with iron and sulfur, and a reliable granular option for both indoor and outdoor planting situations.

Ingredients

Our premium blend of sulfur-coated urea, ammonium sulfate, and potash enriched with iron and micronutrients delivers vibrant blooms and lush foliage for acid-loving plants.