Boerenjasmijn

Philadelphus coronarius

Engels: Mock Orange

shrubHydrangeaceae

Boerenjasmijn (Philadelphus coronarius) is a shrub from the Hydrangeaceae family that grows up to 350cm tall. This plant thrives in full sun to partial shade and requires low maintenance. Blooms in summer with white flowers and attracts bees and butterflies.

Hoogte

200–350 cm

Breedte

150–300 cm

Zonligging

full sun, partial shade

Waterbehoefte

moderate

Grondsoort

loam, clay soil, sandy soil, chalky soil

Onderhoud

low maintenance

Bloeitijd

summer

Bloemkleuren

white

Ecologische waarde

Trekt bijen aan

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Verzorgingskalender

Taak	Jan	Feb	Mrt	Apr	Mei	Jun	Jul	Aug	Sep	Okt	Nov	Dec
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Care tips

Planting

Mock orange is best planted between October and November or in March and April, when the soil is workable and the shrub is dormant or just breaking dormancy. Choose a position in full sun or partial shade; flowering will be most abundant in sun, but the plant tolerates a few hours of shade without complaint. This adaptable shrub accepts a wide range of soil types—loam, clay, sand, or chalky ground—provided drainage is reasonable. Avoid waterlogged sites. Prepare the planting hole to roughly twice the width of the root ball and the same depth. Fork over the base to break up compacted soil, and mix a few handfuls of well-rotted compost or manure into the backfill to improve structure and give the roots a good start. Position the shrub so the top of the root ball sits level with the surrounding soil; planting too deep can lead to stem rot. Backfill carefully, firming the soil gently with your heel as you go to eliminate air pockets. Water thoroughly after planting—give it a full watering can or two—to settle the roots. Apply a 5–8 cm layer of mulch (garden compost, bark chips, or leaf mould) around the base, keeping it a few centimetres clear of the stems to prevent rot. If planting in spring, keep an eye on watering through the first summer, especially during dry spells. Autumn-planted specimens usually establish with less fuss thanks to winter rain. Space plants about 200 cm apart if you're planting a hedge or informal screen; mock orange grows vigorously and will fill the gap within a few seasons.

Pruning

Mock orange flowers on wood produced the previous year, so timing is critical: prune in July, immediately after the blooms have faded. Pruning later in summer or in winter will remove next year's flowering shoots and leave you with a green shrub and no scent. The goal is to keep the plant open, healthy, and floriferous. Start by removing any dead, damaged, or crossing branches entirely, cutting back to a main stem or to ground level. Then identify the oldest stems—those that are thick, dark, and producing fewer flowers—and cut up to one-third of them right down to the base. This encourages vigorous new growth from the roots, which will flower abundantly the following summer. Mock orange responds very well to this kind of renewal pruning and can become congested and flower-shy if left unpruned for years. After removing the old wood, shorten the stems that have just flowered by about one-third, cutting just above a healthy outward-facing bud or side shoot. This keeps the overall shape tidy and encourages branching lower down. Use clean, sharp secateurs for stems up to pencil thickness, and a pruning saw for anything thicker. If your mock orange has become overgrown or neglected, you can renovate it hard in July by cutting the entire shrub down to 30–50 cm from the ground. It will resprout vigorously and should flower again within two years. Water and mulch well after hard pruning to support recovery.

Maintenance

Mock orange is low-maintenance once established. Water regularly during the first growing season to help roots settle in, especially in dry weather. After that, the shrub is fairly drought-tolerant and only needs watering during prolonged dry spells in summer. A deep soak every couple of weeks is better than frequent shallow watering. Avoid overwatering; mock orange dislikes sitting in wet soil. Feed in March or April with a general-purpose granular fertiliser (such as Growmore or blood, fish and bone) scattered around the base at the rate recommended on the packet. Alternatively, apply a 5 cm layer of well-rotted compost or manure as a mulch in early spring; this feeds the soil gently and helps retain moisture through summer. Avoid high-nitrogen feeds, which promote leafy growth at the expense of flowers. Mock orange is fully hardy across temperate Europe (zone 4a–8b) and requires no winter protection. Mulch around the base in autumn helps suppress weeds and insulate roots, but isn't essential for survival. Pests are rarely a problem. Aphids occasionally cluster on soft new growth in spring; a strong jet of water or a spray of insecticidal soap usually deals with them. Diseases are uncommon, though powdery mildew can appear on leaves in hot, dry summers, especially if the plant is stressed or crowded. Improve air circulation by thinning congested growth during the July prune, and water at the base rather than overhead. Leaf spot may occur in wet seasons but is mostly cosmetic and doesn't require treatment.