How to Grow Retama
Retama
Parkinsonia aculeata
shrubRetama is a thorny, drought-tolerant shrub native to the southwestern United States and Mexico, known for its distinctive green stems and bright yellow flower clusters. It produces elongated seed pods and is highly adapted to arid and semi-arid climates. The plant is prized for its ability to thrive in harsh conditions with minimal water and maintenance.
When should you plant Retama in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Retama timeline · Pittsburgh, PA (Zone 6b)
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Plant Retama
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Retama
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Retama dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 9-11, hardy to zone 8b in protected locations
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Get my Retama timeline →Growth Stages
Seed Germination
2-4 weeksSeeds sprout and develop first true leaves; seedlings emerge slowly over 2-4 weeks
Scarify or soak seeds for 24 hours before planting; keep soil lightly moist; provide warm temperatures (70-85°F)
Seedling & Establishment
3-6 monthsYoung plants develop primary root system and early stem growth with few leaves visible
Water moderately but allow soil to dry between waterings; protect from frost; provide bright light; avoid overwatering which causes root rot
Vegetative Growth
6-12 monthsPlant develops more branching, green stems become more prominent, foliage increases gradually
Reduce watering frequency; apply light pruning to encourage bushier shape; minimal fertilizer needed; allow plant to acclimate to heat
Flowering
2-3 months (spring-early summer)Distinctive bright yellow flower clusters appear along stems; flowers are fragrant and attract pollinators
Do not fertilize during flowering; maintain dry conditions; allow natural blooming cycle; no deadheading necessary unless seed prevention desired
Fruiting & Maturity
3-4 monthsElongated brown seed pods develop after flowering; plant enters dormant or slow-growth period
No supplemental water needed; allow pods to dry on plant; minimal maintenance required; established plants are completely self-sufficient
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Usually not serious; use netting if needed; natural predators typically control populations
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Rarely problematic on established plants; spray with neem oil if severe infestation occurs
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Increase humidity with occasional misting; use insecticidal soap if necessary; encourage natural predators
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Prune affected branches; apply horticultural oil spray in early spring before new growth
Uses
Pollinator & Wildlife Habitat
WildlifeRetama's yellow flowers attract bees, butterflies, and other pollinators, providing essential nectar in desert landscapes. The dense thorny branches provide shelter and nesting sites for birds and small desert animals. [source]
Xeriscaping & Landscape Design
HouseholdWidely used in water-conservation landscaping throughout arid regions, retama requires no irrigation maintenance once established and serves as an attractive focal point or screening plant. Its green stems provide year-round visual interest. [source]
Traditional Wood Use
CraftThe wood of retama has been traditionally used for small crafts, tool handles, and decorative items in southwestern and Mexican cultures. It is relatively hard and durable. [source]
Traditional Folk Medicine
MedicinalIn traditional Mexican and southwestern Native American medicine, retama leaves and bark have been used to prepare decoctions for various ailments, though scientific validation is limited. [source]
Food Source Potential
CulinaryIn traditional cultures, retama seeds have been occasionally used as a food source or ground for nutritional purposes, though the plant is not commonly cultivated for culinary use today. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Retama is not typically harvested for food or traditional crops. Seeds can be collected from dried pods in late summer/fall for propagation. The wood can be harvested for crafting purposes. Prune selectively for shape maintenance in late winter or early spring before new growth.
Fun Facts
- 🌱 Retama is sometimes called 'horse bean' or 'Mexican palo verde' and can fix nitrogen in soil through its root nodules, improving soil fertility naturally.
- 🌱 The plant's photosynthetic green stems allow it to continue producing energy even when it sheds its small leaflets during drought stress, a remarkable adaptation to extreme aridity.
- 🌱 Retama can live for 50+ years in ideal conditions and becomes increasingly drought-tolerant with age, making it an excellent long-term investment for desert gardens.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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