Snapdragon Deadheading for Rebloom: Technique and Lifespan Realities

Getting Snapdragons to Rebloom: Shear, Don't Just Pinch

Spent snapdragon spikes need removal—but technique matters, and so does understanding their biennial nature.

Proper Deadheading

• Use clean shears/scissors
• Cut stem just above a leaf node with visible buds
• Don't tear—damages cambium, invites disease
• Remove entire spent spike, not just flowers

Rebloom Timeline

• Cool climates: continuous bloom with deadheading
• Hot climates: spring bloom → summer dormancy → fall rebloom
• Zone 7-8: shear back hard after spring flush for fall show

The Biennial Reality

Snapdragons (Antirrhinum majus) are short-lived perennials grown as annuals/biennials.

• Year 1: vegetative rosette
• Year 2: spectacular bloom (best year)
• Year 3: declining, woody, sparse

Most nursery plants are Year 2 forced into bloom. They'll rebloom if deadheaded, but won't match Year 2 glory. Plan to replace annually for best display.

Self-Sowing Bonus

Allow a few late spikes to set seed. Volunteers appear next spring—free Year 2 plants!