7 Step Peony Itoh Staking Method with Link Stakes on Bartzella

Why Bartzella splays where herbaceous peonies stay upright

Bartzella is an intersectional Itoh hybrid, bred from herbaceous and tree peony parentage, so its crown behaves differently from familiar herbaceous cultivars such as Sarah Bernhardt or Festiva Maxima. The base is partly woody. Those basal stems can persist for 30 to 40cm above the soil, then the plant pushes softer new growth that carries the yellow double flowers.

That change in stem texture is where the trouble starts. The lower framework remains stiff while the upper section bends outward at the join, especially after rain settles into a 12cm bloom. Once the first heavy shower has pulled the outer stems down, the lean usually stays there. A mature clump can open about 30 flowers over a fortnight, so the load arrives in waves instead of in one neat flush.

A single hoop often leaves Bartzella half supported. An Itoh spreads wider than it stands tall: a three-year plant may reach about 90cm high and close to 110cm across. The support has to catch the edge at two heights and give the centre a few places to rest. A circular grow-through ring with a fixed 50cm diameter leaves too many open gaps on a broad crown.

Interlocking L-shaped Link Stakes are useful because the diameter is made on the plant, not chosen from a preset hoop. Link-Stakes and several Niwaki-adjacent suppliers sell sections with 45cm and 60cm leg lengths. Clip the pieces end to end and the ring can widen with the clump instead of squeezing the stems into a shape they have already outgrown.

Step one and two: set the first tier at the 15cm shoot stage

Start when the new shoots are 12 to 15cm high, which in most temperate gardens falls in the second half of spring. At that size the red-bronze Itoh shoots show the true edge of the crown, while the foliage is still open enough for your hands and the stake legs. Wait much longer and the stems firm quickly; threading metal through them becomes clumsy work.

For the inner tier, push four 45cm link stakes into the soil about 20cm out from the crown centre. Angle the legs slightly outward and clip the sections into a loose square. Once seated, the horizontal bars should sit roughly 30cm above the ground.

This lower square catches the woody basal stems before they begin to lean away from the crown. Press each leg in by hand to a depth of 12 to 15cm. In heavy clay, make the holes first with a 10mm steel bar driven to the same depth; that saves the galvanised legs from bending. The square can be a little irregular, provided it sits below the eventual foliage line. Leaf expansion will hide it.

Step three to six: build the perimeter and test the lean

The outer tier carries most of the strain once buds swell. Add six to eight 60cm link stakes 35 to 40cm from the crown centre. Clip them into a hexagon on a younger plant or a rough octagon on a broad clump. A four-year Bartzella with a 110cm spread will usually take eight sections; a smaller plant often needs six.

Set the clips so the horizontal bars land at about 55 to 60cm high. That puts the metal just below the point where the softer flowering stems begin to arch. Each stem then meets a bar early in its outward movement, before the bend concentrates at the woody junction.

Now bridge the inner square and the outer ring. Use two or three spare link sections diagonally across the gap, clipping them at both ends. These cross-pieces give the central stems a place to lean when the heaviest terminal buds start to pull them sideways or inward. Without those diagonals, the middle of a mature clump can drop through the open space even when the outside still looks well contained.

Check the setting before the leaves fill in. Stand back, choose a flowering stem, and push it gently outward by hand. It should move only 8 to 10cm before it meets a bar. If it travels farther, unclip the nearest outer section, bring it in by about 5cm, and seat it again. Small changes made at this stage disappear under foliage within ten days of leaf expansion.

Rain is the real test. A dry double flower may sit politely above the leaves, then sag hard after a shower when water gathers in the petals and the supporting stem turns into a lever. On a mature Bartzella, several outward-facing stems can pull at the same part of the ring during one downpour. Galvanised 60cm link stakes seated 15cm deep hold their shape well in that situation. Thin green plastic hoops sold for herbaceous borders tend to bow outward by midsummer, leaving the clump more sprawled than it was before staking.

Step six is restraint. Tie nothing tightly. Itoh stems thicken through the season, and twine cinched at installation can mark or girdle the stem by the time the bud colours up. If one tall stem needs extra help, use soft jute in a loose figure-eight between stem and bar, leaving a finger of slack.

Step seven: leave the frame through the feeding season

Keep the link stakes in place until autumn, when the spent flower stems are cut back to the woody base. The Itoh framework stands over winter without extra support, so the sections can be lifted, stacked flat, and stored after the cut-back.

Pulling the stakes as soon as flowering ends invites late weather to flatten the foliage. Those leaves are still feeding next year’s crown, which is reason enough to let the frame stay quiet under the plant for the rest of the season.

Slugs, mulch, and the hidden base of a staked clump

Bartzella shoots at 12cm are prime slug food, and a staked clump is harder to inspect at the base once the leaves unfurl. Lay a 1cm collar of Strulch mineralised straw mulch around the crown at shoot-break, keeping it 5cm clear of the stems themselves. Its embedded ferric texture deters slugs while the link stakes are being installed, and doing both jobs in one session disturbs the emerging crown only once.

Where slugs have already rasped a shoot tip, leave the stem in place. It may branch oddly, yet it can still flower.

Tools that earn space beside the crown

For autumn cut-back, Niwaki Higurashi secateurs handle the woody Itoh stems cleanly. The stems can be around 15mm thick, and a sharp bypass cut at the woody base leaves less ragged tissue than a worn blade. Ragged stubs invite dieback; clean cuts make the end-of-season work neater and faster.

For staking, the kit is simple: the link sections, a 10mm bar for clay, and soft jute for the occasional loose tie. Bamboo-and-string cradles sold for dahlias are built around vertical tying and repeated lashing. Bartzella is easier to manage with a low, wide frame that catches stems around the crown as they move outward.

The finish on the metal matters. Powder-coated stakes chip at the clips, then rust at the joint within two seasons. Once the interlock seizes, the frame loses the main advantage of a modular system: the ability to change diameter as the clump widens year-on-year.

Plain hot-dip galvanised sections come apart cleanly in autumn and reseat in spring. That matters because Bartzella can gain 15 to 20cm of spread each year until it settles around year five. On the oldest clumps, the basal framework may stiffen enough that the inner square earns less space, especially where the autumn cut-back has left a strong woody base. The useful support is the one that accepts that a crown keeps changing shape.