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Iris x hollandica Golden Harvest

Iris x hollandica Golden Harvest
Dutch Iris

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This Dutch iris is captivating with the purity and brilliance of its yellow colour, only slightly darker at the throat. Hardy and easy to grow in well-drained soil, it blooms in late spring, or even earlier in the south, and rests in summer. Plant it in autumn, in groups of 10 bulbs, and it will return every year and naturalize over time.  
Flower size
9 cm
Height at maturity
55 cm
Spread at maturity
10 cm
Exposure
Sun
Hardiness
Hardy down to -20°C
Soil moisture
Dry soil, Moist soil
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Best planting time October to November
Recommended planting time September to October
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Flowering time May to June
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Description

The Iris (x) hollandica 'Golden Harvest' is a Dutch iris that stands out for its sunny colour, almost pure yellow. This bulbous iris blooms for 2 to 3 weeks, earlier or later in spring depending on the climate. Refined and colourful, the stylized flowers of Dutch irises stand out for their elegance in the garden, as well as in bouquets. They are hardy bulbs that are easy to grow in all regions. They only require sunlight and well-drained fertile soil.

The Dutch irises, or bulbous irises, have an underground storage organ in the form of a bulb, not a rhizome like their famous cousins the Iris germanica, or bearded irises. Belonging to the same botanical family as the latter, the iridaceae family, they also differ by the absence of "beards", those pretty little fluffy and colourful tongues found on the drooping sepals of bearded irises. The first Dutch irises (x) never grew in the wild on Dutch soil, but are the result of cross-breeding between 2 main botanical species: Iris filifolia, sometimes confused with Iris xyphium which resembles it, both originating from Spain and North Africa, and Iris tingitana from Tangier and northern Morocco. The genealogy of Dutch hybrids is sometimes confusing, but the result is always remarkable. Their flowers, somewhat underused in the garden, are highly appreciated in floristry.

Over time, 'Golden Harvest' Dutch Iris forms a narrow, erect clump measuring 55-60 cm (22-24in) when in bloom. This perennial spreads indefinitely through the production of bulblets. This cultivar generally flowers in May-June (as early as March-April in the south) for 2 to 3 weeks, on thin but sturdy stems. Its solitary or paired flowers on the stems measure 8 to 10 cm (3 to 4in) in diameter, relatively slender compared to those of Iris germanica, but with undeniable elegance. They are a vibrant, uniform yellow. Each flower consists of 3 upright, slender, translucent petals of small size. Beneath this trio are 3 almost horizontal petals, closely linked to the dentate petaloid styles on the edges, arranged in a staggered pattern. Wider, they are spatulate, brushed with dark yellow at the base. Each flower can last 5 to 7 days, even in a vase. The bulb is round, 2 to 3 cm (1in) wide, covered with a fibrous tunic of a pinkish beige colour. It produces a few linear, thin and leathery leaves, somewhat resembling those of a grass, slightly glaucous green, often slightly striated and folded in half towards the ground. They frequently appear in autumn, persisting more or less depending on the severity of the winter and drying up in summer during the dormant period.

Less known and less used by gardeners than bearded irises, Dutch irises are nevertheless easy to grow, with undeniable elegance and indifferent to wild grasses that struggle to infiltrate their very vertical clumps. Plant them in groups of 10 to 20 bulbs of the same variety; they will come back year after year to offer you more and more refined and joyful flowers, which go well with the spring flowering of shrubs. They also look superb planted in the midst of perennials such as peonies and daylilies, which will mask their absence in summer when they are dormant. Their Mediterranean origins give them excellent adaptation to summer drought. Finally, pick their flowers to make bouquets with roses, arums or even late tulips. All irises need a sunny exposure to flower well. Give them at least half a day of full sun.

Iris x hollandica Golden Harvest in pictures

Iris x hollandica Golden Harvest (Flowering) Flowering

Plant habit

Height at maturity 55 cm
Spread at maturity 10 cm
Growth rate normal

Flowering

Flower colour yellow
Flowering time May to June
Flower size 9 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Semi-evergreen
Foliage colour medium green
Foliage description Deciduous foliage in summer.

Botanical data

Genus

Iris

Species

x hollandica

Cultivar

Golden Harvest

Family

Iridaceae

Other common names

Dutch Iris

Origin

Cultivar or hybrid

Product reference176361

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Planting and care

Plant the bulbs in September-October, in a sunny location, in ordinary but fertile, deep, and well-drained soil (even sandy or rocky). Add some coarse sand or compost to your soil if necessary. Plant the bulbs 10 cm (4in) deep and preferably in groups of the same variety, spaced 10-15 cm (4-6in) apart. Cut off the faded flowers at their base, being careful to leave the stem. Continue to water the plants at their base. Once the foliage turns yellow, remove it and leave the bulbs in place for them to flower again the following year. After flowering, water three times with liquid fertilizer at one-month intervals. Leave the bulbs in place for several years. Dutch Irises rest in the summer, preferably in dry soil. Their bulbs dislike consistently wet soil during the summer resting period.

Divide clumps after 4 to 5 years when they appear less floriferous. Do this once the leaves have dried at the beginning of the resting period.

The leaves of the Dutch Iris should only be cut when dry; they allow the bulb to replenish its reserves for the following spring's flowering. Remove the pods as they form so that the plant does not exhaust itself producing seeds.

Planting period

Best planting time October to November
Recommended planting time September to October
Planting depth 10 cm

Intended location

Suitable for Meadow, Rockery
Type of use Border, Container
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Amateur
Planting density 50 per m2
Exposure Sun
Soil pH Neutral
Soil moisture Dry soil, Moist soil, Well-drained soil, even dry in summer.

Care

Pruning instructions Remove the faded flowers so that the plant doesn't exhaust itself producing seeds.
Pruning Pruning recommended once a year
Pruning time June
Soil moisture Dry soil, Moist soil
Disease resistance Very good
Overwinter Can be left in the ground

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