Hydrangea Not Blooming? Sulfur Won't Help—Winter Protection Will

Reader Question: Sulfur Gave Great Leaves But No Flowers; Also Rose Fertilizer Advice

"In Plymouth, MA, my hydrangeas produce only 1–2 flowers. I added sulfur for more blooms but got only green leaves. How do I get flowers? Also, what fertilizer for roses?"

Expert Answer: Sulfur Adjusts pH, Not Flower Production

Sulfur lowers soil pH to turn pink hydrangea blooms blue—it does not stimulate flowering. Your lush foliage confirms the plant is growing well; the issue is bud survival.

Why No Flowers?

Bigleaf hydrangeas bloom on old wood. In Massachusetts, extended freezing temperatures kill flower buds. Sulfur doesn't fix that.

Solution: Winter Stem Protection

• In November, wrap bushes in burlap and stuff with shredded leaves.
• Remove in April after last frost.
• Fertilize in early summer with balanced fertilizer.

Rose Fertilizer Recommendation

• Osmocote 14-14-14 (3-month slow release) – apply in spring.
• 10-10-10 monthly – alternative granular program.
• Supplement: 20-20-20 water-soluble (1 tsp/gal) every 14 days during active growth.

Roses are heavy feeders; consistent nutrition supports repeat blooming.