Container Tomato Blossom Drop: Cool Weather, Pollination, and Water Management

Tomatoes Flowering But Not Setting Fruit in Half Barrels? Check Temperature First.

Four varieties, great blooms, no tomatoes. In wine barrels with drainage. Classic cool-spring blossom drop.

Primary Suspect: Cool Temperatures

• Tomatoes need 65-85°F days, 55-75°F nights for pollination
• <65°F average = pollen sterile, flowers abort
• Solution: Agricultural fleece at dusk, remove morning. Adds 5-10°F overnight.

Secondary: Blossom Drop (Environmental)

• Spray seaweed extract once — helps stress tolerance
• Ensure pollinators access (shake plants midday)

Water Management in Barrels

• Cool weather: let dry between waterings
• Hot weather: consistent moisture (1-1.5"/week)
• CRITICAL: Even supply prevents blossom end rot & cracking
• Mulch barrel surface (straw, wood chips)

Other Checks

• Lower leaf curl = normal aging OR early blight (check for spots)
• Feed every 2 weeks (tomato formula)
• Full sun non-negotiable
• Support: tall stakes/cages at planting

Warmth arrives → fruit sets. Barrels are excellent tomato containers. Patience + fleece.