Garden Scheme

Plant library  ·  Annual Flowers

Angelonia

Angelonia angustifolia

Angelonia brings upright spikes of snapdragon-like flowers to sunny planting plans from late spring into fall. At about 18 inches tall and 12 inches wide, it makes a compact vertical accent without taking over a small bed. Its heat- and humidity-tolerant character suits exposed summer locations where lower, broader annuals may need a little visual lift.

  • Pollinator friendly
  • Deer resistant
Sunlight Full Sun
Water Moderate
USDA zones 9–11
Spacing 1 ft
Mature size 1.5 ft tall, 1 ft wide
Bloom Late spring - fall

Placement and use

Place angelonia through the front-to-middle of a sunny border, where its narrow upright form can rise behind low edging plants without blocking the view across the bed. Repeat it in small groups to make a clear vertical rhythm along a path or at the outer edge of a patio planting. It also works well in containers, where the flower spikes give height above lower surrounding plantings. Leave a reachable edge beside dense displays so spent seasonal plants can be removed cleanly.[1][2]

Spacing and mature footprint

Set plants 12 inches apart, center to center. This matches the roughly 12-inch mature width, creating a close, continuous display while keeping each plant assigned to a clear square of the plan. In a long border, measure spacing from plant centers rather than from foliage edges. Keep the row set back from paths or bed edging so mature stems remain inside the planting area rather than leaning into circulation space.

Three plants set 1 ft apart, center to center; shaded circles show the 1 ft mature spread.

Sun, water, and soil

Give angelonia full sun and moderate water, with soil that drains well after rain or irrigation. Use it in open beds rather than places shaded by shrubs, walls, or taller seasonal plantings for much of the day. In containers, allow room for watering at the soil surface and choose a potting mix and container that do not hold standing water around the roots.[1][2]

Seasonal notes

Angelonia occupies its full role as a warm-season annual, carrying color from late spring into fall. Reserve its footprint in the plan for the whole growing season rather than treating it as a brief filler between spring and summer displays. Its upright flower spikes can keep a border legible as neighboring annuals widen, but clear the space when the seasonal planting is finished so the next design can be installed without crowding.

Planning caveats

Avoid tightly enclosed or poorly drained pockets, especially where neighboring plants shade the bed and slow drying after watering. The stems normally hold their upright form without staking, so supports need not occupy space in the layout. Leave enough separation from irrigation hardware and crowded foliage to keep watering directed at the root zone and maintain airflow around the planting.[1][2]

Growing facts

Botanical name
Angelonia angustifolia
Type
Annual
Category
Annual Flowers
Lifecycle
annual
USDA hardiness zones
9–11
Sunlight
Full Sun
Water
Moderate
Plant spacing
1 ft
Mature size
1.5 ft tall, 1 ft wide
Bloom season
Late spring - fall
Pollinator friendly
Yes
Deer resistant
Yes
Native to North America
No

References

  1. Angelonia - Angelonia angustifolia — North Carolina Extension Gardener Plant Toolbox
  2. Angelonia — UF/IFAS Gardening Solutions

Editorial content updated 2026-07-20.