Allium 'Judith' is a clump-forming bulb in the Amaryllidaceae grown for its terminal flowerheads produced on leafless stems from May to July. The plant has deciduous foliage that dies back after flowering. It prefers full sun and well-drained soils and is rated H6 (very hardy). Suitable uses include borders, gravel beds, containers and as a source of cut flowers.

Allium 'Judith' is a clump-forming bulb that flowers from May to July and suits sunny, well-drained sites in UK gardens.

Allium is a large genus of monocotyledonous flowering plants with 1112 accepted species, making Allium the largest genus in the family Amaryllidaceae and among the largest plant genera in the world. Many of the species are edible, and some have a long history of cultivation and human consumption such as the onion, garlic, scallions, shallots, leeks, and chives.

Allium 'Judith'

Allium 'Millenium' is a perennial, bulbous member of the Amaryllidaceae grown for its seasonal flowering. It bears linear, channeled or flat leaves and blooms from May to July. Plant it in full sun on neutral loam that drains freely, ideally on a south‑facing, sheltered site, where its average UK hardiness (H4) is appropriate.

Allium 'Millenium' blooms from May to July and prefers full sun on neutral, well-drained loam in a south-facing, sheltered spot.

Allium 'Millenium'

Allium 'Summer Beauty' is a clump-forming cultivar in the genus Allium (family Amaryllidaceae) that flowers from May to July. It has deciduous foliage and prefers a south-facing, sheltered site in well-drained neutral loam. Rated H6 (very hardy) for UK gardens, it suits a range of informal and urban planting situations. Gardeners use it in borders, gravel areas and for cut flowers.

Allium 'Summer Beauty' flowers from May to July and favours full sun on a south-facing, well-drained neutral loam site.

Allium 'Summer Beauty'

Allium albopilosum is a bulb that produces upright, bare flowering stems from a single bulb. It has deciduous, strap-shaped basal leaves that die back as the flowers open. A member of the Amaryllidaceae, it is native to Central Asia and flowers from May to July. The plant suits a sunny, well-drained position on neutral to alkaline soils.

Allium albopilosum suits full sun on light, alkaline soils and flowers from May to July.

https://en.wikipedia.org/wiki/Allium_cristophii

Ornamental onions are grown for spherical or loosely pendent heads of small starry flowers held on bare stems well above the foliage, giving them a distinctive floating quality in a border. Colour runs through violet, purple, rose, yellow and white, and the dried seedheads are as valuable as the flowers, standing crisp for months. Strap-shaped or grassy basal leaves tend to die back untidily as the flowers open, so the trick is planting them where something else conceals the base.

Allium albopilosum

Onion, Flowering | Allium albopilosum

Allium bulgaricum is a bulbous member of the Amaryllidaceae, sending up upright, mostly bare stems from a bulb and producing its flowers in May to July. It bears strap-shaped, grassy basal leaves that are deciduous and die back as the blooms open. Best sited in full sun on light, free-draining soils of neutral to alkaline reaction. Native to Bulgaria, it tolerates both exposed and sheltered positions.

Onion Allium bulgaricum is a bulbous Allium from Bulgaria that flowers in May–July and prefers full sun with light, free-draining, neutral to alkaline.

https://en.wikipedia.org/wiki/Allium_siculum

Allium bulgaricum

Onion | Allium bulgaricum

Allium cepa 'Goldito' is a clump-forming member of the Amaryllidaceae grown for its seasonal display from May to July. It carries linear, strap-shaped leaves and prefers a sunny, south-facing spot in neutral loam with good drainage. The cultivar suits a sheltered position and is rated H6 (very hardy) for UK conditions. Use it in borders, rock gardens or in containers where its clumping habit can be shown off.

Allium cepa 'Goldito' is a clump-forming Allium flowering May to July, suited to south-facing, well-drained neutral loam.

Allium cepa 'Goldito'

Allium cepa 'Goldito' | Allium for borders & containers

Allium christophii (albopilosum) is a bulbous Allium native to Iran and Central Asia, commonly sold as Star of Persia. It produces its flower heads in May to July and the blossoms are unscented. Give it full sun in well-drained, neutral to alkaline soil on an exposed, south-facing site; it is hardy (H5) in the UK and toxic if ingested.

Star of Persia (Allium christophii (albopilosum)) flowers May to July and prefers full sun with well-drained neutral to alkaline soil in exposed.

Allium christophii (albopilosum)

Star of Persia | Allium christophii (albopilosum)

Allium hookeri 'Zorami' is a clump-forming Allium in the Amaryllidaceae grown for its summer flowering. It has deciduous foliage and produces an upright display from May to July. Plant it in sun on a sheltered, south-facing site in a neutral loam where drainage is good. Its habit suits mixed borders and containers where seasonal flowering is wanted.

Allium hookeri 'Zorami' is a clump-forming Allium that flowers from May to July and prefers a sunny, sheltered, south-facing loam site.

Allium hookeri 'Zorami'

Hooker Chives | Allium hookeri 'Zorami'

Allium phanerantherum is a clump-forming bulb in the Amaryllidaceae, known by the common name conspicuous-anthered garlic which alludes to its prominent anthers. It produces deciduous leaves and a leafless flowering stalk that appears in late spring to early summer. Flowers are produced between May and July and the plant favours full sun and well‑drained soils.

Conspicuous-anthered garlic (Allium phanerantherum) is a clump-forming bulb that flowers May to July and prefers full sun on well-drained soils.

Allium phanerantherum

Conspicuous-anthered garlic | Allium phanerantherum

A clump-forming bulb of the Amaryllidaceae, Allium schmitzii originates from Portugal and Spain and flowers from May to July. It has deciduous foliage and grows from bulbs in clumps. The plant prefers full sun and well-drained soils and will tolerate chalk, clay, loam or sand across a wide pH range. It is rated H6, so it is very hardy in most UK gardens.

Allium schmitzii prefers full sun and well-drained soils and flowers May to July, ideal for gravel, containers, borders and cut flowers.

Allium schmitzii

Allium sphaerocephalum is a bulbous perennial in the Amaryllidaceae that sends upright, bare stems from a bulb to carry its flowers. It produces strap-shaped basal leaves that die back as the flowers open. Flowering occurs May to July. Plants prefer full sun on light, free-draining loam, sand or chalk with neutral to alkaline soil.

Onion, Flowering (Allium sphaerocephalum) is a bulbous Allium that flowers May to July and prefers full sun in light, free-draining neutral to alkaline.

https://en.wikipedia.org/wiki/Allium_sphaerocephalon

Allium sphaerocephalum

Onion, Flowering | Allium sphaerocephalum

Allium turcomanicum is a clump-forming bulb in the Amaryllidaceae and a member of the genus Allium. It has deciduous foliage and produces flowers from May to July. The plant favours full sun and well-drained soils across a wide range of soil types and pH. It suits south-, west- or east-facing positions and tolerates both exposed and sheltered sites.

Allium turcomanicum is a clump-forming bulb that flowers May to July and prefers full sun and well-drained soils for borders, gravel and containers.