Piilu Clematis
Piilu Clematis
Compact Pink Blooms, Often Double, on a Patio-Sized Vine
Piilu Clematis (Clematis 'Piilu') is a charming, compact clematis that flowers twice with a fun trick: the first flush on old wood is often semi-double or double, while the later flush on new wood is single. Both are soft mauve-pink with a deeper rose bar and a cluster of pale stamens. Short and free-flowering, it's ideal for containers and small trellises, and it's zone 4 hardy with the usual preference: top in the sun, roots in cool shade. Whether you're dressing a patio pot in Edina, climbing a deck trellis in Maple Grove, or filling a tight spot in Woodbury — Piilu brings abundant pink to zone 4b–5a yards.
Piilu Clematis Plant Details
| Attribute | Detail |
|---|---|
| Scientific Name | Clematis 'Piilu' |
| Plant Type | Compact deciduous flowering vine |
| Mature Height | 4–6 feet (with support) |
| Mature Spread | 2–3 feet |
| Sun | Full sun to part shade (6+ hours for best bloom); keep the roots cool and shaded |
| Water | Moderate — consistent moisture in well-draining soil; water containers often |
| USDA Zones | 4–9 (Twin Cities is zone 4b–5a) |
| Soil | Rich, well-draining; amend Minnesota clay-loam with compost |
| Pruning Group | Group 2 — light prune in early spring for double early flowers; can be cut harder if you only want single blooms |
| Bloom | Mauve-pink flowers with a rose bar — double/semi-double first, single later; late spring into summer |
| Winter Hardiness | Reliable to zone 4; mulch the crown the first winter |
Piilu Clematis Uses in Minnesota Landscapes
Containers and compact supports
Its small stature makes Piilu one of the best clematis for a large patio pot with a trellis or a slim obelisk in a Plymouth border.
Trellises and rails
Train it up a deck rail, lattice, or doorway trellis. It climbs by twining leaf stems, so give it thin supports to grab.
Cut flowers and pollinators
The double early blooms are charming in arrangements, and bees visit both flushes.
Best Time to Plant Piilu Clematis in Minnesota
Spring (late April–May) and early fall (late August–September) are both excellent. Avoid summer heat, and never plant after mid-October — frost-heaving kills new roots.
How to Plant Piilu Clematis
- Site it so the top gets sun but the roots stay cool and shaded — "head in the sun, feet in the shade."
- Dig 2–3× the root ball width and set the plant 2–3 inches deeper than it grew in the pot to guard against clematis wilt.
- Backfill with native soil plus 20–30% compost; for containers use a quality potting mix. Water in well.
- Install the support at planting and tie young stems to start them climbing.
- Mulch 2–3 inches over the root zone; keep mulch off the stems.
Watering Piilu Clematis in Minnesota
First Year Watering Schedule
- Weeks 1–2: Every 2–3 days, deep and slow
- Month 1–2: Every 3–4 days
- Month 3–6: Weekly; containers may need water every 1–2 days in summer heat
- Stop watering 2–3 weeks before ground freeze (typically late October in the Twin Cities).
After Year One
Water deeply during dry spells. Container plants dry out fast — check them daily in summer and keep evenly moist.
Why are some flowers double and others single?
That's Piilu's signature. Double or semi-double flowers form on old wood in the first flush; the later flush on new wood is single. Light spring pruning preserves the doubles.
How do I prune it?
Treat it as Group 2: light prune in early spring to keep the early doubles. If you don't mind all-single flowers, you can cut it harder — it forgives either approach.
Will it survive a Minnesota winter?
Yes — hardy to zone 4. Mulch the crown the first winter or two.
You May Also Like
- Boulevard Nubia Clematis — compact ruby-red patio clematis
- Bees Jubilee Clematis — large mauve-pink with a carmine bar
- Pink Champagne Clematis — vivid deep-pink, vigorous