Annual
Pansy
Viola x wittrockiana · Violaceae
Also called: Garden pansy, Viola
Pansy (Viola x wittrockiana) is a moderate-water annual well suited to Tucson and the low desert. It thrives in full sun in winter, with a moderate growth rate.
Pansy at a glance
- Water use
- Moderate (established)
- Sun
- Full sun in winter; provide light afternoon shade in late spring to prolong the season. 6+ hours preferred.
- Mature size
- 6–9 in tall, 6–12 in spread.
- Growth rate
- Moderate
- Bloom
- Almost all colors — purple, blue, yellow, white, orange, red, bronze, and multicolor 'faces.', Late fall through spring (Nov–Apr/May) in Tucson.
- Cold hardiness
- Cold-hardy for an annual; tolerates frost and brief temps into the low 20s°F. Heat-intolerant — fades as daytime highs reach the 80s°F.
- Soil
- Rich, well-drained soil amended with organic matter; slightly acidic to neutral preferred but tolerates alkaline desert soil with compost and good drainage.
- Native range
- Hybrid of garden origin (derived from European Viola species including V. tricolor and V. lutea).
- Best used as
- Winter color beds and borders, Containers and hanging baskets, Edging, Edible flowers (petals are edible) for garnish
- Wildlife
- Modest nectar for early bees on warm winter days.
- Toxicity
- Non-toxic to people and pets; flowers are edible.
How to grow Pansy in Tucson & the low desert
Watering
Cool-season annual: plant transplants mid-Oct through Nov once nighttime temps cool (UA advises waiting until cooler weather is here to stay, ~Oct 15+). Keep consistently moist — pansies dislike drying out; water 2–3x/week, more in dry windy spells. Remove plants when heat sets in (May).
Fertilizer & nutrients
Amend beds with compost at planting. Feed regularly with a balanced or bloom-type fertilizer every 2–3 weeks (they are fairly heavy feeders for an annual); a light steady nitrogen source keeps foliage green and bloom continuous.
Pruning & care
Deadhead spent flowers frequently to keep plants blooming and prevent legginess; pinch back stretched stems.
Notes
A core Tucson winter bedding plant. Do not plant too early — wait for cooler weather (mid-October or later) or transplants stall in the heat. Pairs classically with snapdragons, stock, and dianthus. Distinguished from violas by larger, fewer flowers.
Sources: University of Arizona Cooperative Extension – Pima County Monthly Gardening Guides (Sept/Oct); Missouri Botanical Garden Plant Finder; AMWUA / Tucson nursery cool-season planting guides