Snapdragon
Antirrhinum majus
Old-fashioned favorites with dragon-mouth blooms in vibrant colors. Cool-weather performers that often survive mild winters.
Overview
Companion Planting
Calendula
MarigoldToxicity
Snapdragons are considered non-toxic to humans, dogs, and cats according to the ASPCA.
Planting Tips
1 cm of water per m² equals 10 liters. Use the Watering Calculator for exact amounts.
Care Tip: Pinch young plants to encourage bushier growth and deadhead spent flowers regularly to prolong blooming.
Common Pests
Aphids
Symptoms: Clusters of small insects on new growth and undersides of leaves, causing curling and sticky honeydew residue.
Treatment: Spray with insecticidal soap or a strong jet of water to dislodge them.
Prevention: Encourage natural predators like ladybugs and avoid over-fertilizing with nitrogen.
Spider Mites
Symptoms: Fine webbing on undersides of leaves, stippled or yellowing foliage, and leaf drop in severe cases.
Treatment: Apply neem oil or miticide; increase humidity around plants.
Prevention: Keep plants well-watered and mist foliage during hot, dry periods.
Caterpillars (Budworms)
Symptoms: Holes chewed in flower buds and petals, with frass (droppings) visible near damage.
Treatment: Hand-pick caterpillars or apply Bacillus thuringiensis (Bt) spray.
Prevention: Inspect plants regularly and remove eggs before larvae hatch.
Common Diseases
Snapdragon Rust (Puccinia antirrhini)
Symptoms: Circular, dark brown or reddish-brown pustules on undersides of leaves and stems, leading to wilting.
Treatment: Remove and destroy infected plant parts; apply a fungicide containing sulfur or chlorothalonil.
Prevention: Ensure good air circulation, avoid overhead watering, and choose rust-resistant cultivars.
Downy Mildew (Peronospora antirrhini)
Symptoms: Yellowish patches on upper leaf surfaces with grayish-purple fuzzy growth underneath, stunted growth.
Treatment: Remove affected foliage and apply a copper-based fungicide.
Prevention: Space plants adequately for airflow, water at soil level, and avoid working with wet plants.
Botrytis Blight (Gray Mold)
Symptoms: Gray, fuzzy mold on flowers, stems, and leaves, often starting on spent blooms or damaged tissue.
Treatment: Remove infected material promptly and apply a fungicide if widespread.
Prevention: Deadhead spent flowers, avoid overhead irrigation, and ensure good air circulation.