angled onion

allium angulosum

Also known as: ["angled garlic","star grass"]

Family: Amaryllidaceae Genus: Allium Category: Flowers

Overview

A bulbous perennial herbaceous plant with slender, angular stems and star-shaped flowers, native to Europe and Asia.

Benefits & Perks

["long-flowering","deer resistant","wildlife attractant (bees, butterflies, birds)","drought tolerant"]

Botanical Classification

Phylum: Magnoliophyta
Class: Liliopsida
Order: Asparagales
Family: Amaryllidaceae
Genus: Allium
Botanical Name: Allium angulosum

Plant Characteristics

Basic Information
  • Category: Flowers
  • Suitable Location: garden bed or container in a sunny spot
  • Suitable For:
    Beginners Outdoor Landscapers Wildlife Supporters
  • Is Weed: No
  • Allergenicity: low
Environmental Needs
  • Climate: {"temperatureRange":"5–35°C"}
  • Hardiness: {"zones":"4–9"}
  • Misting: rarely required, only if ambient humidity is very low
  • Drainage: Fast-draining.
  • Soil Type: Loamy, well-draining soil with added organic matter.
Maintenance Level
  • Maintenance Level: low
  • Toughness Level: moderate
  • Pruning Frequency: After flowering; as needed to tidy foliage.
  • Pruning Intensity: Light.
Care Details

Ideal Sunlight Coverage:
Full sun (6–8 hours/day); tolerates partial shade in hot climates.

Sunlight Tolerance Tips:
Acclimate gradually to intense sun; protect from harsh afternoon sun in summer.

Warning Signs: Yellowing leaves (overwatering); stunted growth (poor soil).

Care Requirements

Care Difficulty
easy

easy

Sunlight

full sun to partial shade

Rotate pot for even growth; use sheer curtains in intense light; outdoor placement preferred.

Watering

every 7–10 days during active growth, reduce in winter

Water at the base to avoid foliage disease; ensure soil dries between waterings.

Soil

well-drained, sandy loam with moderate organic matter

pH: Slightly acidic to neutral (pH 6.0–7.0).

Ensure soil dries between waterings; avoid heavy clay soils.

Temperature

Hardy in USDA zones 3–8; tolerates cold winters; prefers moderate summer temperatures.

Avoid sudden temperature shifts; protect from extreme heat/cold; ensure good air circulation.

Fertilizing

every 4–6 weeks during spring and summer

Fertilize after planting; stop in late summer; avoid over-fertilizing.

Propagation

Methods

Division of bulbs or seeds.

Step-by-Step Propagation Guide
  1. Divide offsets from parent bulb.
  2. Plant at same depth.
  3. Water lightly.
  4. Sow seeds shallowly.
  5. Keep moist.

Best Time: Divide bulbs in fall or spring; sow seeds in spring.

Environment

Warm, bright location with moderate humidity for seeds; outdoor conditions for bulbs.

Medium

Well-draining soil mix with sand or perlite for bulbs; standard seed starting mix for seeds.

Hormone

Not required for bulbs; optional for seeds to encourage germination.

Timeline

Bulbs establish in 1–2 seasons; seeds may take 1–2 years to flower.

Tools Needed

Garden trowel, pruners, pots, labels.

Quick Tips

Divide every 3–4 years; store seeds in cool, dry place; plant bulbs in groups for visual impact.

Pruning & Repotting

Pruning Guide
Method

Snip flower stalks at base; remove yellowing leaves.

Pruning Plan

Minimal pruning needed; remove spent flower stalks to encourage bulb growth.

Tools

Hand pruners, scissors.

Checklist

Remove deadheads; cut back only yellowed leaves; avoid cutting green foliage.

Repotting Guide
Best Season

Fall or early spring before active growth.

Pot Size

Use a pot 2–3 inches wider than the bulb cluster.

Method

Lift bulbs carefully; trim dead roots; replant at same depth in fresh soil.

Suggestions

Repot only if bulbs become overcrowded or soil degrades.

Checklist

Inspect roots; refresh soil; ensure proper drainage; space bulbs appropriately.

Advanced Care Tips

Watering Mastery
Watering Checklist

Check soil moisture; water deeply; ensure drainage; adjust for season.

How to Apply Water Properly

Water thoroughly until it drains from the bottom, ensuring even moisture reaches the root zone without waterlogging.

Pro Tip: Use a watering can with a narrow spout to direct water to the roots.
Watering Schedule Tips

Water deeply once the top inch of soil is dry; reduce frequency in winter to prevent root rot.

Soil Improvement

Add sand or perlite for drainage; incorporate compost for fertility.

Temperature Stress Management
Signs of Temperature Issues

Wilting in heat; yellowing or browning leaves in cold.

Cold Stress

Slows growth; may cause leaf discoloration; bulbs can rot in waterlogged soil.

Solution: Ensure well-draining soil; mulch bulbs in winter; protect from frost.

Hot Stress

Stunted growth; drooping foliage; reduced flowering.

Solution: Provide afternoon shade; increase watering; use mulch to retain moisture.

Fertilizing Guide
Fertilizing Checklist

Use balanced fertilizer; dilute properly; apply during active growth; cease in dormancy.

Fertilizing Method

Use balanced liquid fertilizer diluted to half strength every 4–6 weeks during growing season; avoid winter feeding.

Common Problems & Solutions

Yellowing leaves in Allium angulosum may indicate nutrient deficiencies, overwatering, or root issues, affecting photosynthesis and overall plant health.

Wilting in Allium angulosum can result from water stress, either due to drought or overwatering, leading to reduced turgor pressure and impaired nutrient uptake.

Leaf spots on Allium angulosum are often caused by fungal or bacterial pathogens, leading to reduced photosynthetic efficiency and potential defoliation.

Rotting, particularly root or bulb rot, can occur in Allium angulosum due to excessive moisture or fungal infections, causing decay and eventual plant death.

Toxicity Warning

Cats
Toxic

Cats are highly sensitive to the organosulfur compounds in Allium angulosum, which can cause severe hemolytic anemia by damaging red blood cells. The toxicity can be life-threatening if not addressed promptly.

⚠️ Symptoms:
vomiting diarrhea lethargy pale gums rapid breathing collapse
🌿 Toxic Parts:
bulbs leaves flowers
⚡ Toxic If:

if eaten

Ensure cats cannot access the plant. Immediate veterinary care is required if ingestion is suspected.
Dogs
Toxic

In dogs, ingestion of Allium angulosum can lead to oxidative damage to red blood cells, resulting in hemolytic anemia. The organosulfur compounds disrupt red blood cell integrity, causing them to rupture prematurely.

⚠️ Symptoms:
vomiting diarrhea lethargy pale gums difficulty breathing weakness
🌿 Toxic Parts:
bulbs leaves flowers
⚡ Toxic If:

if eaten

Keep plants out of reach of pets. If ingestion is suspected, seek veterinary attention immediately.
Humans
Toxic

Allium angulosum contains organosulfur compounds that can cause gastrointestinal distress and other systemic effects upon ingestion. These compounds irritate the mucous membranes of the digestive tract, leading to inflammation and discomfort.

⚠️ Symptoms:
nausea vomiting diarrhea abdominal pain dizziness
🌿 Toxic Parts:
bulbs leaves flowers
⚡ Toxic If:

if eaten

Avoid consumption. Keep away from food preparation areas and ensure proper disposal of plant material.
Important: Keep this plant out of reach of children and pets. If ingestion occurs, contact poison control or veterinary services immediately.

Frequently Asked Questions

Q: Is Allium angulosum toxic to pets?

A: Yes, it is mildly toxic to dogs and cats if ingested.

Q: How should I care for Allium angulosum?

A: Plant in well-drained soil in full sun; water moderately during growing season and reduce watering in winter.

Q: Does Allium angulosum attract wildlife?

A: Yes, it attracts bees, butterflies, and birds with its star-shaped flowers.

Quick Reference
Family: Amaryllidaceae
Care: easy
Light: full sun to partial shade
Water: every 7–10 days during activ
Suitable For: ["beginners","outdoor landscapers","wildlife supporters (attracts bees, butterflies, birds)"]
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