Western Tansy Mustard
descurainia pinnata
Also known as: ["Western Tansy Mustard","Pinnate Tansymustard"]
Overview
A herbaceous annual or biennial plant native to western North America, characterized by pinnately divided leaves and small, yellowish flowers.
Benefits & Perks
["drought tolerant","wildlife attractant (bees, butterflies, birds)"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Brassicales |
| Family: | Brassicaceae |
| Genus: | Descurainia |
| Botanical Name: | Descurainia pinnata |
Plant Characteristics
Basic Information
- Category: Herbs & Weeds
- Suitable Location: rock gardens, borders, or open meadows
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"0–35°C"}
- Hardiness: {"zones":"5–9"}
- Misting: rarely required
- Drainage: Fast-draining to prevent waterlogging.
- Soil Type: Well-draining, loamy soil with added organic matter; avoid heavy clay soils.
Maintenance Level
- Maintenance Level: very low
- Toughness Level: very high
- Pruning Frequency: Light pruning can be done as needed; major pruning in late winter or early spring before new growth begins.
- Pruning Intensity: Light to moderate; avoid heavy pruning unless necessary to control size or shape.
Care Details
Ideal Sunlight Coverage:
Full sun to partial shade; 6–8 hours of direct sunlight per day, with some afternoon shade in hot climates.
Sunlight Tolerance Tips:
Acclimate plants gradually to intense sunlight; protect from harsh afternoon sun; adjust placement based on seasonal light changes.
Care Requirements
Care Difficulty
very easymoderate
Sunlight
full sun to partial shade
Rotate plant for even light exposure; use sheer curtains to filter intense sun; monitor for sunburn.
Watering
every 7–10 days during active growth, reduce in winter
Water thoroughly but infrequently; ensure soil dries between waterings; avoid overhead watering.
Soil
well-draining, sandy or loamy soil
pH: Slightly acidic to neutral, pH 6.0–7.0.
Use a mix of potting soil and perlite; avoid overwatering; test soil pH periodically.
Temperature
Prefers cool to moderate temperatures, 50–75°F (10–24°C); tolerates mild frosts but avoid prolonged freezing.
Avoid placing near drafty windows; use shade cloth in summer; protect from frost.
Fertilizing
every 4–6 weeks during spring and summer
Apply fertilizer to moist soil to prevent root burn; flush soil occasionally to prevent salt buildup; reduce feeding in dormancy.
Propagation
Methods
Stem cuttings or seed; stem cuttings are faster and more reliable.
Step-by-Step Propagation Guide
- Take a 4–6 inch cutting.
- Remove lower leaves.
- Dip in rooting hormone.
- Plant in moist medium.
- Keep humid and warm.
Best Time: Spring or early summer when the plant is actively growing.
Environment
Warm, humid environment with indirect light; maintain temperatures around 70–75°F (21–24°C).
Medium
Well-draining potting mix, such as a mix of peat, perlite, and sand.
Hormone
Rooting hormone is recommended to improve success rates.
Timeline
Roots typically form in 3–6 weeks; new growth may appear in 2–3 months.
Tools Needed
Pruning shears, rooting hormone, small pots, misting spray bottle.
Quick Tips
Use healthy, non-flowering stems; maintain high humidity with a plastic cover; keep out of direct sun.
Pruning & Repotting
Pruning Guide
Method
Pinch back tips to encourage branching; trim back leggy stems to just above a leaf node.
Pruning Plan
Prune to maintain shape, encourage bushier growth, and remove dead or diseased parts.
Tools
Pruning shears, clean scissors, gloves.
Checklist
Sanitize tools; prune dead or damaged growth; shape as desired; dispose of clippings properly.
Repotting Guide
Best Season
Early spring before the growing season begins.
Pot Size
Increase pot size by 1–2 inches in diameter; ensure good drainage holes.
Method
Remove plant gently; trim any circling roots; place in a slightly larger pot with fresh soil; water lightly.
Suggestions
Repot every 2–3 years or when the plant becomes root-bound; beneficial for maintaining vigor.
Checklist
Choose appropriate pot; prepare new soil mix; handle roots carefully; water after repotting.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture; water deeply; ensure drainage; adjust for season.
How to Apply Water Properly
Water at the base of the plant, ensuring moisture reaches the root zone; allow excess water to drain away; water in the morning to reduce evaporation.
Watering Schedule Tips
Water deeply once the top inch of soil feels dry; reduce frequency in winter to prevent root rot.
Soil Improvement
Add perlite or coarse sand for drainage; incorporate compost for fertility; ensure good aeration.
Temperature Stress Management
Signs of Temperature Issues
Wilting, yellowing leaves, stunted growth, or leaf drop in extreme heat or cold.
Cold Stress
Slows growth, may cause leaf discoloration, and can lead to root damage in freezing conditions.
Solution: Provide frost protection in winter; avoid sudden temperature drops; ensure good soil drainage to prevent cold root damage.
Hot Stress
Leaves may scorch, wilt, or drop; growth may slow due to excessive heat.
Solution: Provide shade during peak heat; increase watering frequency; improve air circulation around the plant.
Fertilizing Guide
Fertilizing Checklist
Check fertilizer type; dilute correctly; apply during active growth; avoid winter feeding.
Fertilizing Method
Use a balanced, water-soluble fertilizer diluted to half strength; fertilize every 4–6 weeks during the growing season (spring to early fall); avoid fertilizing in winter.
Common Problems & Solutions
Toxicity Warning
Cats
Slightly ToxicCats that ingest Descurainia pinnata may experience mild gastrointestinal symptoms. The plant is not highly toxic but can cause discomfort.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Dogs
Slightly ToxicIngestion of Descurainia pinnata by dogs can lead to mild gastrointestinal upset. The plant's effects are typically not severe but can cause discomfort.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Humans
Slightly ToxicDescurainia pinnata contains compounds that can cause mild gastrointestinal distress and other mild symptoms upon ingestion. The plant's physiological impact is generally limited to the digestive system.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: Is Descurainia pinnata edible?
A: No, it is not recommended for consumption due to potential toxicity.
Q: How does Descurainia pinnata spread?
A: It spreads primarily through wind-dispersed seeds.
Q: Does Descurainia pinnata require much care?
A: No, it is very low maintenance and highly tolerant of harsh conditions.
Quick Reference
| Family: | Brassicaceae |
| Care: | very easy |
| Light: | full sun to partial shade |
| Water: | every 7–10 days during activ |
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