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Mexican Petunia (Ruellia caerulea), Perennial

Varieties We Bring In

PinkRuellia caeruleaCompactaRuellia caerulea
Sizes & Pricing
1 galFrom$6.95
3 galFrom$14.95

Last received Nov 4, 2026.

We bring this in seasonally, so what is on the lot changes week to week. A received date shows when it last came in, not that it is here today.

Call (904) 471-0440 to confirm this plant and size before you make the trip.

LightFull Sun, Part Shade
WaterModerate
Salt toleranceModerate
Mature size3-4 feet × 3-4 feet (dwarf cultivars 10-18 inches)

Pet toxicity: Non-toxic to dogs and cats

Pet safety guide

About Mexican Petunia

Mexican petunia (Ruellia simplex) is a vigorous tropical perennial with funnel-shaped purple, pink, or white flowers that bloom nearly year-round in NE Florida. IMPORTANT: the standard species is a Florida Category 1 invasive that spreads aggressively by seed and runners. Only sterile UF-released cultivars such as the Mayan™ or Aztec™ series should be planted; these provide the same ornamental value with greatly reduced invasive risk.

Plant details

Bloom Season
Spring, Summer, Fall, Winter
Flower Color
White, Pink, Purple, Blue
Growth Rate
Fast
Foliage
Evergreen
Soil
Sandy, Loam, Clay, Moist, Well-drained

Best planting months

Recommended forZone 9b · St. Augustine, FL

Recommended months: March, April, May, September, October, November.

January, other month
February, other month
March, good window
April, good window
May, good window
June, other month
July, other month
August, other month
September, good window
October, good window
November, good window, this month
December, other month
This monthGood windowOther months

Seasonal care

Bloom season. Good planting window.

Care essentials

Light

Mexican petunia grows in full sun to part shade throughout NE Florida; it is extremely adaptable to varying light conditions. Only plant UF-released sterile cultivars (Mayan™ series) — standard Ruellia simplex is a Category 1 invasive in Florida.

Water

Extremely adaptable to wet or dry conditions; moderate watering is adequate in NE Florida. Even sterile cultivars spread by creeping roots — site carefully and remove any seedlings or runners that escape the intended area.

Soil & Fertilizer

Tolerates virtually any soil — sandy, loam, clay, wet or dry — common throughout NE Florida. Minimal fertilizer needed; lightly fertilize in spring. Choose only sterile or compact cultivars (UF Mayan™ or Aztec™ series) to reduce invasive spread.

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Common questions

Is Mexican Petunia a good plant for St. Augustine?

Mexican Petunia is a perennial. Mature size: 3-4 feet × 3-4 feet (dwarf cultivars 10-18 inches). Light: Full Sun, Part Shade. Water needs: Moderate. Recorded hardiness zone: 9a. Recorded salt tolerance: moderate.

What is the recorded pet toxicity for Mexican Petunia?

Non-toxic to dogs and cats

Care information verified from

Last reviewed February 2026. Our care guidance comes from trusted horticulture sources and decades of helping St. Augustine gardeners. Conditions here can vary dramatically from one area to the next, so come ask us and we'll tailor it to your yard.