Sweet Pea Killers: Heat, Not Cold

Sweet peas (Lathyrus odoratus) are cool-season annuals. Here's what kills them:

Primary Killer: HEAT

• Temps >80°F → flowering stops, plants decline, die.
• They're "done in by the heat" every summer.

Secondary: Hard Freeze

• Below 28°F kills seedlings.
• Usually planted after last frost, so heat gets them first.

Cultural Needs

• Rich, well-drained soil.
• Regular water (not soggy).
• Monthly high-potassium fertilizer (tomato feed).
• Blood meal for long stems.
• Support for climbing.

Pests/Diseases

Few serious issues. Aphids, powdery mildew, slugs occasionally. Heat is the inevitable end.

Enjoy them in spring; accept summer demise as natural.