perennialN. America Native

Downy Thorn-Apple

The Story

Plant Bio

Datura innoxia, the downy thorn-apple, is a robust, sprawling herbaceous perennial or annual subshrub reaching two to five feet in height, with dull grayish-green leaves covered in soft glandular hairs. The foliage feels clammy to the touch and emits a heavy, narcotic scent when bruised or disturbed.

This species produces large, upright, pure white trumpet-shaped flowers that open in the evening and emit a strong fragrance to attract nocturnal pollinators. It is distinguished from the closely related Datura wrightii by its straight, erect glandular hairs and solid white corollas that lack any lavender or pink tinting.

Uses & Benefits:

Produces large, upright, pure white trumpet-shaped flowers that open in the evening and emit a strong fragrance.

Highly drought-tolerant and unpalatable to deer and rabbits due to its toxic alkaloid content.

Attracts nocturnal pollinators, particularly sphinx and hawk moths, to the evening-opening blooms.

Essentials

At a Glance

Plant Type

Perennial

Height

60"

Width

80"

Light

Full Sun, Partial Sun

Zones

9, 10

Water

Low

Humidity

Low to Moderate

Lifespan

Short-lived perennial or annual

Native To

The Americas

Toxicity

Highly Toxic

Bloom period

Summer – Fall

In flower about 6 months of the year

Planting

How to Grow

Select a planting site in full sun with loose, sandy, or gravelly soil that drains rapidly.
Sow seeds directly into the garden after the last spring frost, or transplant established plugs carefully to avoid disturbing the roots.
Water sparingly once the plant is established, allowing the soil to dry out completely between waterings.
Wear gloves when handling any part of the plant to avoid contact with the sticky, toxic glandular sap.

Pro Tip

Avoid planting in waterlogged or heavily compacted soils, as the fleshy root system is highly susceptible to rot under wet conditions. If growing as a perennial in cold-winter zones, cut the stems back hard and move the container indoors before the first frost.

Keep It Thriving

Care Guide

Do

Wear gloves and wash hands thoroughly after pruning or handling the foliage.
Grow in poor, well-drained soils to maintain a compact, sturdy growth habit.
Provide full sun exposure to maximize flower production and prevent leggy stems.

Don't

Do not overwater or plant in heavy clay soils that retain moisture.
Do not apply heavy nitrogen fertilizers, which stimulate excessive foliage at the expense of blooms.
Do not plant near agricultural crops like tomatoes or potatoes to prevent the spread of shared viruses.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Pest Check
Plant
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

XeriscapingGravel GardensNight GardensDry Borders

Companion Plants

Ipomoea alba Clematis virginiana Agave americana Yucca filamentosa

Multiply

Propagation Methods

Good to Know

Common Questions

Downy Thorn-Apple questions

What zones can Downy Thorn-Apple grow in?

Downy Thorn-Apple is hardy in USDA Zones 9–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Downy Thorn-Apple deer resistant?

Yes — Downy Thorn-Apple is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Downy Thorn-Apple bloom?

Downy Thorn-Apple typically blooms in summer through fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Downy Thorn-Apple need full sun?

Downy Thorn-Apple does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Downy Thorn-Apple drought tolerant?

Yes — once established (usually after the first full season), Downy Thorn-Apple handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.