The Story
Plant Bio
Asparagus densiflorus, Sprenger's asparagus fern, is an evergreen perennial from temperate southern Africa, making arching stems two to three feet long and spreading three to four feet. It is not a fern: the feathery green needles are flattened stems, and small fragrant white flowers are followed by showy red berries. The stems carry small thorns.
Birds take the red berries and spread the seed, and the species has become invasive in Florida, Hawaii and parts of California, where it displaces native undergrowth. Grow it in a container rather than in open ground in those regions, and strip the berries before they ripen; a true fern is the better choice for open planting there.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Perennial
Height
24 inches
Width
36 inches
Light
Full Sun, Partial Sun
Zones
9, 10
Water
Medium
Humidity
Average to high
Lifespan
Perennial
Native To
Temperate southern Africa
Toxicity
Berries toxic if ingested; sap irritates skin
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Plant in spring in organically rich, free-draining soil.
- Site in part shade or bright indirect light indoors.
- Keep the soil consistently moist but never waterlogged.
- Grow it in a container where it is invasive.
- Strip berries before they ripen to prevent spread.
- Cut old stems out at the base to renew the plant.
Pro Tip
The tuberous roots store water, so it recovers from a missed watering far better than a real fern would; do not compensate by overwatering.
Keep It Thriving
Care Guide
Do
- Grow it in a container where it is invasive 🪴
- Give it part shade or bright indirect light 🪟
- Keep the soil evenly moist 💧
- Wear gloves; the stems carry small thorns 🧤
Don't
- Plant it in open ground in Florida, Hawaii or California ❌
- Let berries ripen and be taken by birds ❌
- Let children or pets eat the red berries ❌
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Strip |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Multiply
Propagation Methods
Good to Know
Common Questions
Sprenger's Asparagus Fern questions
What zones can Sprenger's Asparagus Fern grow in?
Sprenger's Asparagus Fern is hardy in USDA Zones 9–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Sprenger's Asparagus Fern deer resistant?
Yes — Sprenger's Asparagus Fern is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Sprenger's Asparagus Fern bloom?
Sprenger's Asparagus Fern typically blooms in seasonal; flowers small and fragrant through late fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Sprenger's Asparagus Fern need full sun?
Sprenger's Asparagus Fern does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Sprenger's Asparagus Fern drought tolerant?
Yes — once established (usually after the first full season), Sprenger's Asparagus Fern handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
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Jersey Knight Asparagus
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Climbing Asparagus Fern
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Keep exploring
Explore the genus
Hardy in your zone?
Grow Sprenger's Asparagus Fern with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.