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Growing Lilies Outdoors

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Discover the secrets of growing lilies outdoors and create a vibrant garden with these essential tips and guidelines.

Lily bulbs are made up of fleshy, overlapping scales.

Key Information:

Key Topics:

  • Lily bulbs are made up of fleshy, overlapping scales.
  • Planting season stretches from late summer to early spring.
  • Well-drained site is essential for growing lilies.

Lily bulbs are made up of fleshy, overlapping scales. There is no outer protective skin and they must therefore not be allowed to dry out. Do not store Lily bulbs – plant them when they arrive. Pick carefully – choose bulbs which are neither bruised nor shriveled.

Planting

The planting season stretches from late summer to early spring-October is the best month. Pick a day when the soil is moist and frost-free. If the bulbs are shriveled or if the weather is not suitable on the day they arrive, pot up in moist peat before planting out.

Most lilies are stem-rooting, producing roots on the stem just above the bulb as well as at the base. These bulbs will need 6 in. of soil on top of them. A few Lilies, such as L.can-didum, are basal-rooting only and they need planting in the autumn and require only 2 in. of soil above them.

Sprinkle coarse sand in the bottom of the hole before planting. Spread out the roots and sprinkle sand between them. Finally, refill the hole with soil.

Site and Soil

A well-drained site is essential. Most soil types are satisfactory, but light land should be enriched with organic matter and heavy soil will need peat and coarse sand if you wish to take Lily growing seriously. It is impossible to generalize, about lime content – many species, such as L.auratum and L.pardalinum, will not thrive if it is present whilst a few others such as L.candidum, require an alkaline soil. Fortunately most of the modern Lily Hybrids are quite tolerant and are not bothered either way. Most Lilies relish a sunny site, but a little shade during the day is not a problem. The lower parts of the plant should be shaded by surrounding shrubs or low-growing perennials. Many varieties are not happy in an exposed situation – choose a sheltered spot.

Summer Care

Lilies must not be allowed to dry out – water thoroughly and regularly during dry weather. Feed occasionally with a liquid fertilizer, such as Instant Bio, and do not hoe – place a mulch around the stems instead. Not all Lilies have to be staked, but if you have a specimen over 3 ft high in an exposed situation thenstaking will certainly be needed. Stake in March rather than waiting until the stems have been blown over.

Dead-Heading

Nip off faded flowers before they form-this will maintain the strength of the plant. At the end of the season allow the stems to die down naturally – cut off at ground level when dead.

Pests & Diseases

Slugs are a menace when the shoots are beginning to appear – sprinkle Slug Pellets around the stems. Aphids are easily controlled by spraying and botrytis can be kept in check with a systemic fungicide. It is mosaic virus which threatens the life of the plant – the warning sign is a yellow mottling of the leaves followed by stunting of the plant and a reduction in both flower numbers and quality in subsequent years. There is no cure – lift the bulbs and burn the infected plants.

Propagation

The easiest method is the division of mature clumps in autumn. Replant immediately and accept the fact that the divided parts may not flower next year. Scaling is a popular method – pull off plump scales from a bulb and plant each one in Seed and Cutting Compost so that the bottom half of each scale is buried. Within 6 weeks tiny bulbs will appear at the scale bases. Pot up each new plant in 3 in. pots and stand them in a cold frame or cool greenhouse.

Many Lilies can be raised from seed, but named varieties will not come true to type. Sow seeds under glass in autumn.

Fascinating flowers

There is a tremendous variation in lily flowers. Although always recognizable as lilies, they appear in no less than six different shapes.

Those that have bell-shaped flowers, such as L. nanum, have petals that are either straight or curve inwards towards the tips. In bowl-shaped flowers (L. auratum, for exam-

I pie), the petals are more widely spaced and slightly recurved or reflexed (that is, rolled back) at the tips.

Cup- or star-shaped flowers, as in the hybrid ‘Bright Star’, are similar but more compact, and may or may not roll back at the tips. L. regale has funnel-shaped flowers. These are more tubular, flaring out towards the mouth. Trumpet-shaped flowers, like those of the popular Easter lily (L. lon-gifiorum) are the same but longer and narrower.

Perhaps the best-known flower form is the turk’s cap or martagon type, with strongly recurved petals – sometimes so much so that the flower becomes actually ball shaped and the long, graceful stamens are fully exposed.

This is not the end of the lily flowers’ variety. While some are pendent, nodding their heads to the ground, others point outwards, or upwards to face the sun.

Many lilies add to their attractiveness with a rich fragrance, although some, such as L. pyrenaicum, actually smell rather unpleasant.

Most lilies flower in mid-summer, but some flower ear-lier or later, so it is perfectly possible to have a succession of lilies blooming in your garden for almost half the year.

The flowers are produced at the top of a single upright stem, grouped in pairs or bunches. The number of flowers can be up to 50 or more, and they appear over a period of several weeks. They vary in size from the modest 2.5cm/1in blooms of L. pumi-lum to those produced by the golden-rayed lily (L. auratum), which can reach 30cm/12in across. Lily leaves are stalkless and relatively insignificant, growing in whorls or scattered evenly up the stem.

True and false lilies

All true lilies – members of the genus Lilium – grow from bulbs. This distinguishes them from plants like arum lily (Zantedeschia) and day lily (Hemerocallis). The bulbs are different from ordinary ones like those of the daffodil, having no papery covering, and consisting of a large number of fleshy scales.

Like the flowers, the bulb shapes vary – some are round and some shaped like the rhi-zome of an iris, while others produce chains of round bulbs linked by stolons.

Many lilies produce bulblets on the underground part of the stem, just above the bulb. A few produce bulbils where the leaves join the stem. Both can be used for propagation.

Species

L. amabile Height 4 ft.

Spacing: 1/2 ft. Stem-rooting. 3 in. turk’s-cap flowers – red with black spots. Disagreeable odour.

Flowering period: June-July.

L. auratum (Golden-rayed Lily) Height 5-8 ft.

Spacing: 1 ft. Stem-rooting. 8-10 in. bowl-shaped flowers – white with yellow stripes, brown spots. Fragrant.

Flowering period: August-September.

L. bulbiferum (Orange Lily) Height 2-4 ft.

Spacing: 9 in. Stem-rooting. 3 in. trumpet-shaped flowers – orange with purple spots.

Flowering period: June-July.

L. canadense (Canada Lily) Height 4-6 ft.

Spacing: 1 ft. Basal-rooting. 2 in. trumpet-shaped flowers – yellow with brown spots.

Flowering period: September- October. Grow in partial shade.

L. candidum (Madonna Lily) Height 4-5 ft.

Spacing: 9 in. Basal-rooting. 3 in. trumpet-shaped flowers – pure white. Fragrant.

Flowering period: June-July.

L. hansonii (Golden Turk’s-cap Lily) Height 4-5 (t.

Spacing: 1 ft. Stem-rooting. VA In, turk’s-cap flowers – yellow with brown spots. Fragrant.

Flowering period: June- July.

L. henryi (Henry’s Lily) Height 6-8 ft.

Spacing: 1/2 ft. Stem-rooting. 3 in. turk’s-cap flowers – yellow with dark red spots. Fragrant.

Flowering period: August- September.

L. longiflorum (Easter Lily) Height 2.5-3 ft.

Spacing: 9in. Stem-rooting. 5-6 in. trumpet-shaped flowers – white. Fragrant.

Flowering period: July-August. Hall hardy – grow under glass.

L. martagon (Turk’s-cap Lily) Height 3-5 ft.

Spacing: 1 ft. Basal-rooting, ½ in. turk’s-cap flowers – purplish brown with dark spots. Disagreeable odour.

Flowering period: June-July.

L. pardalinum (Leopard Lily) Height 3-6 ft.

Spacing: 1 ft. Basal-rooting.

Flowering period: July.

L. pumilum (Coral Lily) Height 1-1.5 ft.

Spacing: 6 in. Stem-rooting.

VA in. turk’s-cap flowers – scarlet.

Flowering period: June. L. regale (Regal Lily) Height 3-6 ft.

Spacing: 1/2 ft. Stem-rooting. 5 in. trumpet-shaped flowers – white with yellow throat. Fragrant.

Flowering period: July- August.

L. speclosum Height 3-5 ft.

Spacing: VA ft. Stem-rooting. 3-5 in. bowl-shaped flowers – white with red markings. Fragrant.

Flowering period: August-September. Half hardy – grow under glass. L. tigrinum (Tiger Lily) Height 3-5 ft.

Spacing: 1/2 ft. Stem-rooting. 3-4 in. turk’s-cap flowers – deep orange with purple spots.

Flowering period: July- September.

Hybrids

L. ’Backhouse Hybrids’ Height3-5ft.

Spacing: 1/2 ft. Basal-rooting. VA in. turk’s-cap flowers – various colours.

Flowering period: June-July. Examples: ‘Brocade’ and ‘Sutton Court’.

L. ’Belllngham Hybrids’ Height 4-7 ft.

Spacing: 1/2 ft. Rhizome-rooting, 3 in. turk’s-cap flowers – various colours, all spotted.

Flowering period: July. Examples: ‘Shuksan’ and ‘Afterglow’.

L. Fiesta Hybrids’ Height 3-5 ft.

Spacing: 1/2 ft. Stem-rooting. 3 in. turk’s-cap flowers – various colours.

Flowering period: July. Examples: ‘Adagio’ and ‘Many Moons’.

L. ’Mid-Century Hybrids’ Height 2-4 ft.

Spacing: 1 ft. Stem-rooting. 4-5 in. trumpet-shaped flowers-yellow, orangeor red, all spotted.

Flowering period: June-July. Example: ‘Enchantment’.

L. ’Olympic Hybrids’ Height 5-6 ft.

Spacing: 1/2 ft. Stem-rooting. 5 in. trumpet-shaped flowers – various colours. Fragrant.

Flowering period: July-August. Example: ‘Black Dragon’.

L. ’Parkmannii Hybrids’ Height 3-5 ft.

Spacing: 1 ft. Stem-rooting. 6-7 in. bowl-shaped flowers – various colours.

Flowering period: July-August. Examples: ‘Imperial Crimson’ and ‘Pink Glory’.

More Information on Growing Lilies Outdoors

Growing Lilies Outdoors

Lily bulbs are unique in their composition, consisting of fleshy, overlapping scales without an outer protective skin. To ensure their vitality, it is crucial not to let them dry out. Rather than storing the bulbs, they should be planted immediately upon arrival. When selecting bulbs, it is important to choose those that are neither bruised nor shriveled.

When it comes to planting lilies, the ideal season stretches from late summer to early spring, with October being the optimal month. Select a day with moist and frost-free soil for planting. If the bulbs appear shriveled or if the weather conditions are unfavorable, pot them up in moist peat before planting them out. Most lilies are stem-rooting, producing roots on the stem just above the bulb as well as at the base. These bulbs require 6 inches of soil on top of them. However, certain lilies, like L. candidum, are basal-rooting and only need 2 inches of soil above them. Prior to planting, sprinkle coarse sand in the bottom of the hole, then spread out the roots and sprinkle sand between them. Finally, refill the hole with soil.

For successful lily cultivation, a well-drained site is essential. While most soil types are suitable, light land can benefit from the addition of organic matter, and heavy soil may require peat and coarse sand. Lime content varies among lily species, with some species, like L. auratum and L. pardalinum, thriving best in its absence, while others, such as L. candidum, prefer an alkaline soil. Fortunately, most modern lily hybrids are quite tolerant of different soil conditions. While lilies generally thrive in sunny sites, a little shade during the day is acceptable. It is advisable to provide some shading to the lower parts of the plants by surrounding shrubs or low-growing perennials. Additionally, it is important to choose a sheltered spot for varieties that are not suited to exposed situations.

During the summer, it is crucial to prevent lilies from drying out by watering them thoroughly and regularly, especially during dry weather. Applying a mulch around the stems instead of hoeing is recommended. While staking is not necessary for all lilies, taller specimens exceeding 3 feet in height, particularly in exposed locations, may require staking. It is best to stake them in March before the stems are blown over.

Dead-heading faded flowers is essential to maintain the plant’s strength. At the end of the season, allow the stems to die down naturally and then cut them off at ground level.

Lilies can be susceptible to various pests and diseases. Slugs can be controlled by sprinkling slug pellets around the stems, aphids can be managed through spraying, and botrytis can be kept in check with a systemic fungicide. However, mosaic virus poses a serious threat to lilies and has no cure. Infected plants should be lifted and burnt to prevent its spread.

Lilies can be propagated through division of mature clumps in autumn, although the divided parts may not flower the following year. Scaling is another popular method, where plump scales are pulled off a bulb and planted in seed and cutting compost, burying the bottom half of each scale. Within six weeks, tiny bulbs will emerge at the scale bases. These new plants should be potted up in 3-inch pots and placed in a cold frame or cool greenhouse.

Although many lilies can be grown from seed, it is important to note that named varieties will not come true to type. Therefore, seeds should be sown under glass in autumn.

Lilies exhibit a fascinating array of flower shapes, with six distinct forms. Some lilies have bell-shaped flowers, while others have bowl-shaped, cup- or star-shaped, funnel-shaped, trumpet-shaped, or turk’s cap-shaped flowers. These flowers can be pendent, nodding to the ground, or facing outwards or upwards. Many lilies also release a delightful fragrance, although some varieties may have an unpleasant smell. With different flowering periods, it is possible to have a succession of lilies blooming in your garden for almost half the year.

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About The Author:

Rupert Foxton-Smythe

Horticulturist and avid plant enthusiast.

Rupert Foxton-Smythe is a seasoned horticulturist and avid plant enthusiast with over three decades of experience in the field of botany. As a leading expert at Houseplant Guru, Rupert brings a wealth of knowledge and a deep passion for all things green.

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