Asteraceae
Tubular Knapweed (Volutaria tubuliflora)
Volutaria tubuliflora
A very drought-tolerant outdoor plant. Requires full sun, well-draining sandy soil, and infrequent watering. No regular fertilization or pruning needed. Best suited for Mediterranean or xeric gardens.
Every 14 days
Direct sun
5° - 38°C
20% - 50%
Categories
What is Tubular Knapweed?
Tubular Knapweed (Volutaria tubuliflora) is a easy-care plant from the Asteraceae family. Tubular Knapweed (Volutaria tubuliflora) is an annual herb in the Asteraceae family, native to North Africa and the Mediterranean Basin. Recognized by its pink-purple tubular flowers and deeply lobed hairy leaves, it thrives in sandy, arid to semi-arid environments. It is considered an invasive spec...
Tubular Knapweed grows up to 1.5m, with spread of 60cm, watering every 14 days, 5°C – 38°C, 20–50% humidity. It is not suitable for indoor environments and safe for pets.
Unlike many tropical plants, Tubular Knapweed tolerates watering mistakes. Best for beginners. Unlike many popular species, Tubular Knapweed is safe to keep around pets.
How to Care for Tubular Knapweed?
TLDR: Tubular Knapweed needs Direct sun, watering every 14 days, and temperatures between 5-38°C with 20-50% humidity.
How Often Should You Water Tubular Knapweed?
Water only when soil is completely dry, approximately every 14 days or less. Highly drought tolerant; overwatering is the primary risk.
How Much Light Does Tubular Knapweed Need?
Requires full direct sunlight for at least 6–8 hours per day. Does not tolerate prolonged shade.
What Is the Best Soil for Tubular Knapweed?
Prefers sandy or gravelly, well-draining soils with pH between 6.5 and 8.0. Tolerates poor and calcareous soils.
What Pot Should You Use for Tubular Knapweed?
Outdoor garden bed, rock garden, or naturalized area. Not suitable for indoor containers.
What Is Tubular Knapweed and Where Does It Come From?
Tubular Knapweed (Volutaria tubuliflora) is an annual herb in the Asteraceae family, native to North Africa and the Mediterranean Basin. Recognized by its pink-purple tubular flowers and deeply lobed hairy leaves, it thrives in sandy, arid to semi-arid environments. It is considered an invasive species in California, USA, where it poses a threat to native desert ecosystems, producing up to 2,500 seeds per plant.
How to Propagate Tubular Knapweed?
Seed Propagation
Direct sowing is preferred. Avoid transplanting as the plant is sensitive to root disturbance.
- 1 Sow seeds directly in the ground after last frost
- 2 Cover lightly with 0.5 cm of sandy soil
- 3 Keep soil slightly moist until germination
- 4 Reduce watering gradually after germination
Materials needed:
How Big Does Tubular Knapweed Grow?
TLDR: Tubular Knapweed can reach up to 1.5m tall with Fast growth rate.
Max height
1.5m
Spread
60cm
Growth rate
Fast
Foliage
Deciduous
Plant Uses
Ornamental
Great for decoration
Is your plant showing symptoms?
Click on the symptom to discover possible causes:
What Diseases Commonly Affect Tubular Knapweed?
TLDR: Tubular Knapweed is susceptible to 3 known diseases. Monitor regularly for early detection.
Powdery Mildew
Powdery mildew is a common fungal disease caused by various fungi species including Erysiphe, Podosphaera, Oïdium, and Leveillula. It affects over 10,000 plant species worldwide. The disease thrives in warm, dry climates with high humidity and appears as a distinctive white powdery coating on plant surfaces.
Aphids
Aphids are small, soft-bodied, pear-shaped insects (1/16 to 1/8 inch long) that feed by sucking nutrient-rich sap from plants. They reproduce rapidly and can quickly weaken plants, causing distorted growth and transmitting plant viruses. Aphids come in various colors including green, black, red, yellow, brown, and gray. They secrete honeydew, a sticky substance that attracts ants and encourages sooty mold growth.
Rust
Rust is a common fungal disease caused by fungi in the order Pucciniales that affects a wide variety of plants. The disease gets its name from the characteristic orange, yellow, or reddish-brown pustules that appear on leaves, resembling metal rust. This obligate fungal parasite requires living plants to survive and can cause significant economic losses in agricultural crops.
Meaning & Symbolism
Symbol of resilience in arid and desert environments. In North Africa, it represents survival and adaptation to harsh conditions.
Fun Facts
Each plant can produce up to 2,500 seeds, making it a highly effective spreader.
Seeds remain viable in the soil for more than 3 years.
It blooms between February and June, one of the earliest spring annuals in desert regions.
It is among the few invasive species established in the Sonoran Desert in California.
Frequently asked questions
How much sun does Tubular Knapweed need?
How often should I water Tubular Knapweed?
Is Tubular Knapweed invasive?
What soil does Tubular Knapweed prefer?
Compare with similar plants
| Attribute | Difficulty | Light | Watering | Pet Safe |
|---|---|---|---|---|
| Peace Lily | Easy | Low light | 4d | ⚠️ |
| Swiss Cheese Plant | Easy | Partial shade | 10d | ⚠️ |
| Golden Pothos | Easy | Low light | 8d | ⚠️ |
| ZZ Plant | Easy | Low light | 18d | ⚠️ |
