Key Facts
- Fuzzy gray green leaves are densely covered in white hairs that give a cobweb appearance
- Produces small three petaled pink to white flowers in summer
- Low spreading perennial often grown as a houseplant or in dry rock gardens
- Prefers well drained sandy to loamy soil and tolerates poor soils
- Likes bright light to full sun but appreciates afternoon shade in very hot climates
- Propagates easily from stem cuttings and by division
- Drought tolerant once established but prone to root rot in waterlogged soil
- Works well in containers, hanging baskets, and mixed succulent plantings
Cobweb Spiderwort is a low, fuzzy perennial valued for dense white hairs on gray green leaves and small pink to white summer flowers. It is used as a container plant and in dry rock gardens where bright light and well drained soil suit its habit and drought tolerance.
Identification
Tradescantia sillamontana has fuzzy gray green leaves densely covered in white hairs that give a cobweb appearance. Plants stay compact at about 6 to 12 inches tall and commonly spread 12 to 24 inches. Flowers are small and three petaled with pink to white blooms in summer in temperate climates.
Where to grow and best uses
This plant works well as a houseplant, in hanging baskets, and in dry rock or succulent mixed plantings. In USDA zones about 9 to 11 it can remain evergreen and spread more vigorously outdoors. In colder climates grow it in containers that can be moved indoors for winter or treat it as an annual.
Planting time and spacing
Plant during active growth in spring or when danger of hard frost has passed. Space plants to match their mature spread of 12 to 24 inches so each clump can form a low mat. Set the crown level with the soil surface and avoid planting into heavy, poorly drained ground.
Light and soil
Cobweb Spiderwort prefers bright light to full sun, with some afternoon shade in very hot climates to protect foliage. It favors well drained sandy to loamy soil and tolerates low fertility. Avoid sites that stay wet because standing moisture leads to root rot and collapse of the plant.
Watering and common problems
The plant is drought tolerant once established but will suffer in waterlogged conditions. Let the topsoil dry between waterings and reduce moisture in cool seasons. Overwatering is the main cause of decline. Watch for mild sap irritation on skin and consult local resources before handling if sensitive.
After flowering and seasonal care
Deadhead faded flowers to tidy the plant and encourage fresh growth. Trim back long stems to maintain a compact shape and divide overcrowded clumps in spring or early summer to renew vigor. In colder areas move containers to a bright indoor spot before freezing temperatures arrive.
Propagation
Propagate easily from stem cuttings which root quickly in soil or water, and by division during active growth. Seeds are possible but less commonly used. Division and cuttings provide fast establishment and are the preferred methods for expanding plantings or refreshing container specimens.
Controlling spread and naturalizing
Spread is moderate and will be greater in warm climates where plants stay evergreen. Use edging or containers to limit naturalizing in beds where unwanted expansion is a concern. Regular trimming and removing spent stems keeps clumps contained and prevents the plant from forming extensive mats.
Containers and indoor culture
The fuzzy foliage and compact habit make this Tradescantia a good candidate for pots and hanging baskets. Use a free draining potting mix and allow the medium to dry slightly between waterings. Provide bright window light and protect from cold drafts during winter when grown indoors.
Frequently asked questions
- How fast does Cobweb Spiderwort grow?
- Growth rate varies with light water and temperature. It commonly spreads to fill a 12 to 24 inch area within a growing season in favorable warm conditions and more slowly in cool or shaded sites.
- Is Cobweb Spiderwort hardy where I live?
- It is generally suited to USDA zones about 9 to 11 outdoors. In colder zones grow it as a houseplant or protect it from hard freezes to prevent die back.
- Can I grow it in mixed succulent pots?
- Yes. It performs well in mixed succulent plantings when the potting mix drains freely and water is applied sparingly to avoid root rot.
- Is Cobweb Spiderwort toxic to pets?
- Sap can cause mild skin irritation in sensitive people and ingestion may cause mild gastrointestinal upset in pets. Verify species specific guidance with local poison control or the ASPCA before making decisions for homes with animals.
- When is the best time to take cuttings?
- Take stem cuttings during active growth in spring or early summer for the fastest rooting and establishment.
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