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Philadelphus polyanthus Mont Blanc - Mock Orange

Philadelphus x polyanthus Mont Blanc
Mock Orange

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More information

This deciduous bush, with a compact and upright habit, is adorned in early summer with graceful white flowers with yellow stamens, abundant and highly fragrant. Not very tall, but vigorous and with a well-provided foliage, the Montblanc mock orange is particularly suited to small gardens. Very hardy, it thrives in any soil, in all areas.
Flower size
4 cm
Height at maturity
1.25 m
Spread at maturity
60 cm
Exposure
Sun, Partial shade, Shade
Hardiness
Hardy down to -23°C
Soil moisture
Dry soil, Moist soil
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Best planting time March, October
Recommended planting time February to May, September to November
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Flowering time June to July
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Description

The Philadelphus polyanthus 'Mont Blanc' is a variety of white Mock Orange well suited to small gardens. Not very tall, not very bulky, it remains graceful and pleasantly fragrant. Its flowers are single, modest, enhanced by a cluster of yellow stamens. The bush is vigorous and floriferous, with an upright habit. It thrives in any soil, even limestone, in all exposures and all areas. Plant your mock oranges in the second or third row of your shrub beds or your country hedges because their prime period, although unforgettable, is not very long!

The Philadelphus are all deciduous bushes native to temperate regions of the northern hemisphere, particularly East Asia and North America. The approximately 60 species that make up this genus were first crossed in France by Jacques and Lemoine, then in the United States, with the fragrance of the flowers sometimes being forgotten in favour of varieties with more spectacular double blooms. Undemanding, mock oranges are occasionally slow to establish. They will need to be regularly pruned after flowering to remain floriferous. They belong to the Hydrangea family.

The 'Mont Blanc' mock orange is a horticultural hybrid. The bush has an irregular upright habit, with the stems slightly arching at their tips. It has rapid growth, reaching an average height of 1.20 m (4ft) with a width of 60-70 cm. Its single flowers, 4 to 5 cm (2in) in diameter, bloom in June-July, sometimes as early as May, depending on the climate. They are gathered in charming clusters. They release a sweet fragrance reminiscent of orange blossoms. Its leaves are abundant, slightly toothed, 4 to 8 cm (2 to 3in) long, a dark green that enhances the flowers. They are ovate in shape, pointed at the tip. The foliage falls in winter.

Rediscover mock oranges; they are simple bushes surrounded by such symbolism that they once reigned in every garden. The poet's jasmine, adapted to all types of gardens, very easy to grow, is ideal for beginner gardeners. This small-sized Mont Blanc variety will be perfect when combined with other shrubs in a bed or a small flowering hedge. Since its flowering period is relatively short, consider pairing it with shrubs that have earlier or later blooming: DeutziaDwarf BuddleiasForsythia, Caryopteris, summer lilacJapanese quince, and shrub roses. Let a small herbaceous clematis climb in its branches, as this will give a wild and charming look to your mock orange. Its white flowering also allows beautiful combinations with perennial plants with blue flowers (or white, to enhance the beauty of an evening garden).

 

Plant habit

Height at maturity 1.25 m
Spread at maturity 60 cm
Habit Irregular, bushy
Growth rate fast

Flowering

Flower colour white
Flowering time June to July
Inflorescence Corymb
Flower size 4 cm
Fragrance Fragrant
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Deciduous
Foliage colour dark green

Botanical data

Genus

Philadelphus

Species

x polyanthus

Cultivar

Mont Blanc

Family

Hydrangeaceae

Other common names

Mock Orange

Origin

Cultivar or hybrid

Other Philadelphus - Mock Orange

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Planting and care

The Philadelphus 'Mont Blanc', is straightforward to grow, requiring very little maintenance and accommodating; it is well suited to all gardens and ideal for beginner gardeners. Ordinary, poor, even limestone soil, not too dry or too wet, suits it. However, it will prefer fresh, well-drained and humus-rich soil. Very hardy, it can withstand temperatures as low as -20°C (1°F). Planting should be done in early spring or autumn, preferably in full sun or partial shade. Excessive heat exposure should be avoided in dry and hot climates. Flowering on the previous year's shoots, the Philadelphus should be pruned after flowering, in July-August, by shortening the flowering branches by one-third of their length. More severe pruning can be done every 2 to 3 years to keep it compact and floriferous. Do not hesitate to cut the old wood and long branches down to the base of the plant to encourage branching from the base. A resistant bush, it may, however, be prone to powdery mildew and black aphids.

Planting period

Best planting time March, October
Recommended planting time February to May, September to November

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Hedge
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Sun, Partial shade, Shade
Soil pH Any
Soil type Clayey (heavy), Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light)
Soil moisture Dry soil, Moist soil, Deep, fertile.

Care

Pruning instructions The mock orange should be pruned after flowering, in July-August, by shortening the branches that have bloomed by a third of their length. Severe pruning can be done every 2 to 3 years to keep it compact and floriferous. To do this, cut the old wood and the branches that are too long down to the base of the plant to encourage it to branch out from the base.
Pruning Pruning recommended once a year
Pruning time July to August
Soil moisture Dry soil, Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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