Yellow Hibiscus / Rose Mallow
Hibiscus syriacus (Yellow variety) / Hibiscus moscheutos • Malvaceae
🌱 Seed Category
Flower
🌍 Origin Region
Southern/Eastern United States and East Asia
📅 Days to Maturity
90-120 days from seed to first bloom. Perennial varieties generally bloom in their second year but can bloom first year if started early.
🌡️ Hardiness Zones
USDA Zones 5-9 (for moscheutos types) or Zones 9-11 (for tropical types); generally treated as a hardy perennial in temperate zones.
About This Seed
The seeds are dark reddish-brown to black, approximately 3-4mm in size, with a rounded to slightly D-shaped profile and a slightly fuzzy or matte texture. The resulting plant is a vigorous perennial shrub or herbaceous plant with large, heart-shaped or lobed leaves and massive, trumpet-shaped yellow flowers with prominent central stamens.
Growing Information
Growing Season
Late spring to early summer planting; direct sow after last frost or start indoors 6-8 weeks prior.
Germination
7-14 days at 70-75°F (21-24°C). Seeds benefit from scarification (nicking the seed coat) or soaking in warm water for 24 hours prior to planting to improve moisture absorption.
Planting Instructions
Plant 1/4 inch deep (6mm). Space seeds or seedlings 24-36 inches apart. Prefers moist, rich soil with a pH of 6.0 to 7.0. Surface sowing is possible with a light dusting of soil as they need some light to stimulate growth.
Sunlight & Water Needs
Full sun (6-8 hours); high water needs. Hibiscus species are moisture-loving and can tolerate boggy conditions, but perform best in consistently moist, well-drained soil.
Companion Plants
Works well with Bee Balm (Monarda), Joe Pye Weed, and Cannas. Avoid planting next to extremely drought-tolerant plants (Xeriscaping) due to high water requirements.
Special Characteristics
Pollinator-friendly, attracting bees, butterflies, and hummingbirds. Heat tolerant and resistant to most common pests, though Japanese beetles may target foliage. Large, showy blooms provide a tropical aesthetic in temperate gardens.