Physocarpus opulifolius 'Diabolo'Spiraea opulifolius, Ninebark

Water regularly throughout the growing season until young Physocarpus plants are fully established. In spring, apply a mulch of well rotted manure or compost to the base of the plant. After flowering, cut back the flowered shoots to a healthy pair of buds, unless seedheads are required for late season interest.

Physocarpus opulifolius tolerates fairly hard pruning and may be cut back by half every few years to maintain a smaller size. On mature plants cut back about one quarter to one fifth of the oldest shoots to their base, to promote strong new growth.

Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £2.99.

Orders which include any other products will incur a delivery charge of £6.99.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £7.99 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details, and more information on different charges that may apply to certain destinations.

For more information on how we send your plants please visit our Helpful Guide on plant sizes.