Autumn and winter are the perfect time to prepare your garden for a new tree peony. Whether your bare-root crown is already on its way or you are planning ahead for next season, a little thoughtful preparation now will pay dividends for decades to come.
Tree peonies are long-lived, permanent additions to the garden — a well-sited specimen can thrive for a century or more. Getting the preparation right from the start is the single most important investment you can make in your plant's future.
Step 1: Choose Your Site Carefully
Tree peonies dislike being moved once established, so choosing the right position from the outset is essential. Take time to observe your garden through autumn and winter before committing to a spot.
Sunlight. Aim for a position that receives at least 5–6 hours of direct sunlight per day, ideally in the morning. Full sun produces the largest, most fragrant blooms. Dappled afternoon shade is acceptable — deep shade is not.
Drainage. This is non-negotiable. Tree peonies will not tolerate waterlogged soil. Avoid low-lying areas where water collects after rain, and steer clear of positions at the base of walls or slopes where water runs off and pools.
Shelter. A position sheltered from strong prevailing winds will protect the large spring blooms and concentrate the fragrance. A wall, hedge, or established shrub border can provide ideal shelter without creating shade.
Space. Allow plenty of room — a mature tree peony can reach 1.5–2 metres in height and spread. Avoid planting beneath established trees where root competition and shade will be problematic.
Step 2: Test and Improve Your Soil
Tree peonies prefer neutral to slightly alkaline soil — pH 6.5 to 7.5. A simple soil test kit, available from any garden centre, will tell you where your soil sits. Most British garden soils fall within the acceptable range, but it is worth checking.
If your soil is acidic, incorporate garden lime in autumn to raise the pH gradually before planting.
Soil structure matters as much as pH. Tree peonies need rich, fertile, free-draining soil with good organic content. In autumn and winter, you can improve your soil significantly by:
- Digging in well-rotted garden compost or leaf mould to improve fertility and structure
- Incorporating horticultural grit into heavy clay soils to improve drainage
- Adding bonemeal to the planting area to encourage strong root development
Step 3: Prepare the Planting Hole
Dig your planting hole well in advance of your bare-root crown's arrival — ideally a few weeks before. This allows the soil to settle and any amendments to begin working.
Dig a hole approximately 50cm wide and 50cm deep — generous enough to accommodate the thick, fleshy roots without bending or cramping them. Mix the excavated soil with well-rotted compost and a good handful of bonemeal, and set it aside ready for backfilling.
If your soil is particularly heavy clay, line the base of the hole with a layer of horticultural grit to ensure water drains away from the root zone.
Step 4: Plan Your Planting Depth
One of the most common mistakes with tree peonies is planting too shallow. The graft union — the distinct swollen point where the stems meet the rootstock — must be planted 5–8cm below the soil surface. This encourages the tree peony to develop its own root system above the graft, making it increasingly self-sufficient and vigorous over time.
Mark the correct depth in your prepared hole before your crown arrives, so you can plant confidently and correctly on the day.
Step 5: Consider Companion Planting
Winter is a good time to think about what will grow alongside your tree peony. Good companions include:
- Spring bulbs — tulips, alliums, and narcissi planted around the base will provide colour before the peony blooms and die back as the peony comes into its own
- Low ground cover — hardy geraniums or epimediums make excellent ground cover beneath tree peonies without competing aggressively for resources
- Structural shrubs — evergreen shrubs nearby provide year-round structure and can frame the peony beautifully in spring
Avoid planting vigorous perennials or shrubs that will compete strongly for water and nutrients in the immediate vicinity.
Step 6: Source Your Plant
If you have not yet reserved your bare-root crown, winter is the time to plan your purchase for the following autumn. The finest Paeonia rockii cultivars sell out each season — early reservation ensures you secure your chosen variety. Whether you are drawn to the ethereal Jing Yun Sai with its white petals and pink-blue spots, or the densely packed dark-red blooms of He Ping Hong Xiu Qiu, early reservation ensures you secure your chosen variety.
At The Tree Peony Queen, we open pre-orders for our autumn allocation well in advance of the October delivery window. Joining our waiting list ensures you are first to know when reservations open.
Browse our imperial Rockii tree peony collection and reserve your specimen →