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Clematis
Clematis × jackmanii
Queen of climbers with large, star-shaped blooms in purple, pink, white, and red.
Quick Facts
Sun:☀️ Full Sun, ⛅ Partial Shade
Water:💧💧 Moderate
USDA Zones:Zones 4–9
Space:🌱 Small Bed, 🏡 Large Garden
Soil:Loam, Clay, Silty
Best Season(s):Spring, Fall
Experience Level:🌿 Intermediate
Native Range:Hybrid origin (parent species widespread Northern Hemisphere)
Bloom Color:Deep purple (many other colors in other Clematis varieties)
Bloom Cycle:Early summer through fall on repeat-blooming types
Care Notes
Keep roots shaded and cool, heads in sun. Pruning group determines timing — check variety label.
Growing Details
Mature Size:8-12 ft climbing height, 2-3 ft spread
Growth Rate:🌿 Moderate
Zone Performance
In zone 4, clematis benefits from winter mulch over the crown and should be sited where snow cover is likely, since exposed crowns can suffer dieback. In zones 8-9, plants perform best with afternoon shade to prevent bloom fade and may rebloom sporadically through a longer growing season rather than in one concentrated flush.
Companions & Wildlife
🦌 Deer Resistance
occasionally damaged
Deer generally avoid mature clematis foliage but will browse tender new spring growth in high-pressure areas.
🐝 Pollinator Value
moderate
Attracts bees and occasionally hummingbirds, though the flowers offer less nectar reward than many other vines.
Good Companions
Climbing Rose — Shares the same trellis or arbor, with clematis threading through rose canes for a layered bloom effect often called a 'marriage.'
Allium (Ornamental Onion) — Shallow-rooted alliums shade the clematis root zone without competing, satisfying the classic 'cool roots, warm head' requirement.
Hosta — Broad hosta leaves planted at the base physically shade clematis roots from direct sun.
Lavender — Low, drought-tolerant lavender at the base keeps foliage off the soil and helps deter slugs that can damage young clematis shoots.
Troubleshooting
⚠️ Clematis wilt (stems suddenly collapse and blacken)
Cut affected stems back to healthy growth at or below soil level; most cultivars resprout from the crown within weeks.
⚠️ No blooms despite healthy vine
Identify the pruning group (1, 2, or 3) from the variety tag and prune at the correct time — wrong-season pruning removes the growth that would have flowered.
⚠️ Powdery mildew on leaves late summer
Improve air circulation by thinning crowded stems and avoid overhead watering late in the day.
⚠️ Pet Safety
Mildly toxic to cats and dogs (protoanemonin) — can cause GI upset and oral irritation.
Informational only — always check with a veterinarian if you suspect your pet has eaten something it shouldn't have.