perennial

Dwarf White Mexican Petunia

Ruellia brittoniana 'White Katie'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Perennial

Height

10 inches

Width

12 inches

Light

Full Sun, Partial Sun

Zones

8, 9

Water

Moderate, drought tolerant once established

Humidity

High

Lifespan

Perennial

Native To

Mexico, South America

Toxicity

Non-toxic

The Story

Plant Bio

Ruellia simplex, commonly known as Mexican petunia, is an herbaceous perennial. It features lance-shaped, dark green leaves on strong, semi-woody stems. From late spring to the first frost, it produces a profusion of trumpet-shaped flowers. 'White Katie' is a dwarf, clump-forming cultivar that typically grows to only 8-12 inches tall. It is prized for its compact habit and profuse, pure white flowers. Unlike the aggressive species plant, it is less invasive due to low seed production.

Uses & Benefits:

Bright white flowers add elegance to sunny borders, attracting pollinators and enhancing garden aesthetics.

Drought tolerant and low-maintenance, ideal for water-wise gardens.

Supports local pollinators and beneficial insects, promoting biodiversity.

Marketplace

Where to Buy

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Planting

How to Grow

Tuck seeds or cuttings into well-drained soil
Water regularly until established, about 6 weeks
Place in full sun for best flowering
Fertilize monthly during growing season
Prune lightly after flowering to maintain shape
Mulch to retain moisture and suppress weeds

Pro Tip

Ensure well-drained soil and full sun for optimal growth

Keep It Thriving

Care Guide

Do

Water regularly during dry spells 🌱
Prune to shape after flowering
Feed with balanced fertilizer monthly

Don't

Avoid overwatering in winter ❌
Don’t let soil stay waterlogged
Skip fertilizing in late fall

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Fertilize
Plant
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Colorful border with tubular white flowersVivid perennial in sunny bedsPollinator-friendly garden feature

Companion Plants

Lantana Salvia Gaillardia Coreopsis Verbena

Multiply

Propagation Methods

Good to Know

Common Questions

Dwarf White Mexican Petunia questions

What zones can Dwarf White Mexican Petunia grow in?

Dwarf White Mexican Petunia is hardy in USDA Zones 8–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Dwarf White Mexican Petunia deer resistant?

Yes — Dwarf White Mexican Petunia is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Dwarf White Mexican Petunia bloom?

Dwarf White Mexican Petunia typically blooms in late spring to frost through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Dwarf White Mexican Petunia need full sun?

Dwarf White Mexican Petunia does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Dwarf White Mexican Petunia drought tolerant?

Yes — once established (usually after the first full season), Dwarf White Mexican Petunia handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.