Aethionema 'Warley Ruber' is an evergreen alpine rockery plant that forms low, mat-forming clumps with a trailing habit and produces its spring display from April to June. It belongs to the Brassicaceae and suits shallow, well-drained sites. Plants do best in full sun on free-draining chalk, loam or sand and can occupy exposed as well as sheltered positions. The form combines compact growth with evergreen foliage useful in rock and wall situations.

Stone Cress 'Warley Ruber' (Aethionema) is an evergreen, mat-forming alpine for full sun and well-drained chalk, loam or sand that flowers April to June.

Aethionema is a genus of flowering plants within the family Brassicaceae. They are known as stonecresses.

Aethionema 'Warley Ruber'

Stone cress 'Warley Ruber' | Aethionema 'Warley Ruber'

Aethionema sax. subsp. corinthiacum is a stonecress in the Brassicaceae that produces erect racemes of cruciform flowers. In the UK it blooms from April to June. Originating on sunny limestone mountainsides of Europe and West Asia, especially Turkey, it favours well‑drained alkaline ground. Plants are typically perennial but can be short‑lived, and bear ovate to linear leaves.

Aethionema sax. subsp. corinthiacum is a stonecress that flowers from April to June and prefers sunny, well‑drained alkaline sites.

Aethionema sax. subsp. corinthiacum

Stonecress | Aethionema sax. subsp. corinthiacum

Alyssum desertorum is a mat-forming alpine in the Brassicaceae that forms a low, spreading carpet of silver-haired foliage. It produces small yellow flowers from May to September held close to the mat. The plant prefers full sun in free-draining loam or sand and tolerates a wide pH range. It is classed H1c (tender) for UK growing and will need winter protection where frosts are severe.

Desert Madwort (Alyssum desertorum) is a mat-forming alpine for full sun in free-draining loam or sand, flowering from May to September.

Alyssum is a genus of over a hundred species of flowering plants in the family Brassicaceae, native to temperate Europe, Asia, and northern Africa, with the highest species diversity in the Mediterranean region. The genus comprises annual and perennial herbaceous plants or (rarely) small shrubs, growing to 10–100 cm tall, with oblong-oval leaves.

Alyssum desertorum

Desert Madwort | Alyssum desertorum

Arabis alpina subsp. caucasica is a mat-forming alpine rockery plant with evergreen foliage, typically 0.1–0.5 metres high and wide. It flowers in the UK from April to June. Best grown in full sun on well-drained soils across chalk, clay, loam or sand and a range of pH levels. It reaches its mature spread in 2–5 years.

A mat-forming alpine for full sun and well-drained soils, flowering April to June and suited to rock, gravel and container planting.

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

Arabis, or rockcress, is a genus of flowering plants, within the family Brassicaceae.

Arabis alpina subsp. caucasica

Mountain rock cress | Arabis alpina subsp. caucasica

Arabis x suendermannii is a mat-forming alpine rockery plant in the Brassicaceae that flowers in spring from April to June. It has evergreen foliage and suits full-sun positions on well-drained soils. Rated H6 (very hardy), it tolerates both exposed and sheltered sites and works equally well in gravel, rock or container situations.

Arabis x suendermannii is a mat-forming, evergreen rockery plant that flowers April to June and prefers full sun with well-drained soil.

Arabis x suendermannii

Arabis x suendermannii | Rockery Arabis for Gravel Gardens

Bornmuellera tymphaea is a flowering plant in the Brassicaceae that produces its blooms in spring, from April to June. It carries deciduous foliage on a well-branched habit and grows in full sun to partial shade. The species tolerates loam, sand or clay soils across acid to alkaline pH so long as they remain moist but well-drained. It is winter-hardy to H6 and suits cottage, informal and wildlife gardens.

Bornmuellera tymphaea blooms from April to June and prefers full sun to partial shade in moist, well-drained loam, sand or clay soils.

Bornmuellera tymphaea

Bornmuellera tymphaea | Spring-flowering Brassicaceae

Brassica napus 'Rnx5321'PBR is a clump-forming rapeseed grown for vegetable and ornamental displays, notable for its yellow flowers from May to September. It has deciduous foliage and establishes in moist but well-drained loam or sandy soils. Plant in full sun on a sheltered south-, east- or west-facing site. The cultivar is rated H5 (hardy) for UK gardens.

Rapeseed (Brassica napus 'Rnx5321'PBR) produces yellow flowers from May to September and prefers full sun on moist, well-drained loam or sand.

Brassica napus 'Rnx5321'PBR

Rapeseed (Brassica napus 'Rnx5321'PBR) | Garden Oilseed

Brassica oleracea (Botrytis Group) 'Andes' is a cauliflower cultivar with an upright, well-branched, columnar habit and glaucous leaves. It grows as an Annual Biennial and prefers full sun on soils that are moist but well-drained. Flowering occurs May to September, when it produces the plant's floral structures.

Cauliflower 'Andes' (Brassica oleracea) prefers full sun on neutral to alkaline loam and flowers May to September.

Brassica is a genus of plants in the cabbage and mustard family (Brassicaceae). The members of the genus are informally known as cruciferous vegetables, cabbages, mustard plants, or simply brassicas.

Brassica oleracea (Botrytis Group) 'Andes'

Cauliflower 'Andes' | Brassica oleracea (Botrytis Group) 'Andes'

Brassica oleracea (Botrytis Group) 'Walcheren Winter 3 - Thanet' is a clump-forming cultivar in the Botrytis (cauliflower) group with deciduous foliage. It favours full sun and performs best in loam or sandy soils that are moist but well drained. Plant on a south-, east- or west-facing, sheltered site in neutral to alkaline soil. It flowers from May to September.

Brassica oleracea (Botrytis Group) 'Walcheren Winter 3 - Thanet' is a clump-forming Brassica for full sun in neutral to alkaline loam, flowering May to.

Brassica oleracea (Botrytis Group) 'Walcheren Winter 3 - Thanet'

Brassica oleracea 'Walcheren Winter 3 - Thanet' | Cauli

Brassica oleracea (Capitata Group) 'Myatt's Early Offenham' is a clump-forming cabbage cultivar used both in vegetable plots and as an ornamental. It performs best in full sun on loam or sandy soils with a neutral to alkaline pH and consistent, well-drained moisture. The foliage is deciduous and plants are hardy in UK conditions (H5). It flowers from May to September.

Brassica oleracea (Capitata Group) 'Myatt's Early Offenham' is an early-heading cabbage for vegetable beds and ornamental displays, flowering May to.

Brassica oleracea (Capitata Group) 'Myatt's Early Offenham'

Cardamine latifolia is a spring-flowering species in the genus Cardamine, belonging to the Brassicaceae (mustard) family. In the UK it is often called Cuckoo Flower or Lady's Smock and flowers from April to June. Gardeners recognise it as a spring-time contributor within the mustard family. Its seasonal bloom period is the most relevant scheduling detail for planting schemes.

Cuckoo Flower (Cardamine latifolia) flowers April to June and belongs to the mustard family, Brassicaceae.

Cardamine is a large genus of flowering plants in the mustard family, Brassicaceae, known as bittercresses and toothworts. It contains more than 200 species of annuals and perennials.

Cardamine latifolia

Cuckoo Flower | Cardamine latifolia

Cardamine macrophylla is a perennial herb notable for its relatively large leaves and compact 0.3 m height. It belongs to the Brassicaceae and originates from a range extending from Russia through to Japan and the Himalaya. Flowers appear in spring and early summer, providing seasonal interest. Plants suit moist to wet situations and tolerate partial shade.

Large-leaved cuckoo flower (Cardamine macrophylla) is a 0.3 m perennial from Russia to Japan and the Himalaya that flowers April to June.

Cardamine macrophylla

Large-leaved cuckoo flower | Cardamine macrophylla

Cochlearia armoracia is a perennial in the Brassicaceae grown for its pungent, spicy root used in cooking and traditional remedies. It prefers full sun or partial shade on moist, well-drained loamy soil with a neutral to alkaline pH. Rated H5, it is classed as hardy for UK conditions and favours a sheltered aspect. It flowers from April to June.

Horseradish (Cochlearia armoracia) is a hardy perennial with a pungent, spicy root valued in cooking and traditional remedies.

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

Horseradish is a perennial plant of the family Brassicaceae. It is a root vegetable, cultivated and used worldwide as a spice and as a condiment.

Cochlearia armoracia

Horseradish | Cochlearia armoracia

Crambe cordifolia is a perennial herbaceous plant that reaches about 2.0 m and is cultivated for its tall summer flowerheads. It flowers from June to August and the blooms are scented. It prefers a sunny position in soils from sandy to clay, provided they are well-drained or moist but well-drained. Use it as a specimen or at the back of a border where its height can be shown off.

Greater sea kale Crambe cordifolia produces tall, fragrant flowerheads in June to August and suits full sun in well-drained sandy to clay soils.

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

Crambe is a genus of annual and perennial flowering plants in the family Brassicaceae, native to a variety of habitats in Europe, Turkey, southwest and central Asia and eastern Africa. They carry dense racemes of tiny white or yellow flowers on stems above the basal leaves.

Crambe cordifolia

Greater sea kale | Crambe cordifolia

Crambe orientalis is a perennial in the Brassicaceae that sends stems to about 1.2 m, each topped with dense racemes of small white or yellow flowers. It flowers from June to August. The plant prefers full sun and a moist but well-drained soil and will tolerate sandy, loamy or clay textures. Rated H6, it is very hardy in UK gardens.

Crambe orientalis produces upright 1.2 m stems with white or yellow racemes from June to August and prefers full sun and moist, well-drained soil.

Crambe orientalis

Crambe pontica is a member of the Brassicaceae family within the genus Crambe, notable for bearing erect stems topped with dense racemes of small flowers. In the UK it blooms from June to August. The flowers sit above a basal rosette of leaves, presenting the inflorescences clearly to pollinators and to the eye. Identification relies on the compact raceme structure typical of Crambe species.

Crambe pontica is a Brassicaceae species that produces dense racemes of flowers in the UK from June to August.

Crambe pontica

Dentaria pinnata is a member of the mustard family Brassicaceae, commonly called Toothwort. It is notable for flowering in early spring, with blooms appearing in March to April. The species sits in the genus Dentaria and is associated with the group commonly referred to as toothworts. Its distinct seasonal flowering makes it useful for early-season interest.

Toothwort (Dentaria pinnata) flowers in March to April and is a member of the mustard family Brassicaceae.

Dentaria pinnata

Toothwort | Dentaria pinnata

Erysimum 'Hector Harrison' is a well-branched, evergreen wallflower in the cabbage family (Brassicaceae) that flowers from April to September. It prefers full sun and free-draining soils on alkaline or neutral ground. Suitable for south-, west- or east-facing sites, it tolerates both exposed and sheltered positions. Use it in containers, city courtyards, cottage borders and wildlife-friendly beds.

Erysimum 'Hector Harrison' is an evergreen wallflower that blooms April to September in full sun on well-drained neutral to alkaline soils.

Erysimum 'Hector Harrison'

Wallflower (Erysimum 'Hector Harrison') | April–Sept

Iberis sempervirens is a perennial in the cabbage family with evergreen foliage and a compact, low-growing habit. It produces its main display of flowers from April to June. Plant in well-drained, sandy or loamy soil in full sun or partial shade for best performance. It suits south-facing spots and is classed H5, so it is hardy in UK conditions.

Perennial candytuft (Iberis sempervirens) is an evergreen perennial that flowers April to June and prefers full sun with well-drained, neutral to alkaline.

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

Iberis, commonly called candytuft, is a genus of flowering plants belonging to the family Brassicaceae. It comprises annuals, evergreen perennials and subshrubs native to the Old World.

Iberis sempervirens

Perennial candytuft | Iberis sempervirens

Iberis sempervirens 'Snowflake' is a spreading, branched evergreen in the Brassicaceae grown for its low, mounding habit and spring flowers. It performs best in full sun on moist but well-drained soils. Plant on south- or west-facing, sheltered sites with alkaline to neutral soils such as chalk, loam or sand. Flowering occurs from April to June.

Iberis sempervirens 'Snowflake' is a spreading evergreen candytuft for sunny, south- or west-facing sites on well-drained alkaline soils, flowering April.

Iberis sempervirens 'Snowflake'

Evergreen Candytuft | Iberis sempervirens 'Snowflake'

Isatis iconia is a member of the Brassicaceae with a columnar upright habit and deciduous foliage. It flowers in spring (April to June). It prefers full sun and moist but well-drained soils on chalk, clay, loam or sand, and will grow on acid, neutral or alkaline ground. Rated H7 in the UK, it suits south-, east- or west-facing sites in either exposed or sheltered positions.

Isatis iconia is a columnar, deciduous Brassicaceae that flowers April–June and prefers full sun on moist, well-drained soils.

Isatis is a genus of flowering plants in the family Brassicaceae, native to the Mediterranean region east to central Asia. Its genus name, Isatis, derives from the ancient Greek word for the plant, ἰσάτις.

Isatis iconia

Isatis iconia | Columnar Isatis for Borders

Isatis kotschyana is an annual to biennial in the Brassicaceae with a columnar, upright habit. It bears deciduous foliage and flowers in spring from April to June. It prefers full sun on well-drained soils across a wide pH range. The upright form suits the middle or rear of borders and prairie mixes where vertical structure is needed.

Isatis kotschyana is a columnar annual/biennial in the Brassicaceae that flowers April to June and prefers full sun with well-drained soils.

Isatis kotschyana

Lunaria annua 'albiflora' is a Brassicaceae species grown for its white spring flowers and the paper-like, coin-shaped seed discs that follow. It behaves as an annual or biennial, producing terminal racemes of white blooms in April to June. After flowering it forms translucent silicles with a central, silvery membrane that can persist into winter. Those rounded seedheads are widely used in dried floral work.

Honesty (Lunaria annua 'albiflora') flowers April to June and produces papery, coin-like seedheads prized for dried arrangements.

Lunaria is a genus of flowering plants in the family Brassicaceae. It is native to Europe and has been introduced to North America and elsewhere.

Lunaria annua 'albiflora'

Honesty | Lunaria annua 'albiflora'

Megacarpaea polyandra is a tall member of the Brassicaceae, reaching around 1.8 m. It flowers from June to August. It prefers full sun and establishes on sandy or loamy soils that are moist but well drained. It carries a UK hardiness rating of H6 (very hardy) and corresponds to USDA zones 6–9.

Megacarpaea polyandra grows to 1.8 m and prefers full sun and sandy or loamy, moist but well-drained soils, flowering June to August.

Megacarpaea is a genus of flowering plants belonging to the family Brassicaceae.

Megacarpaea polyandra

Pachyfragma macrophyllum is a species in the genus Pachyfragma and should be sought under that botanical name when buying or researching. Available information about its appearance and behaviour varies between sources, so confirm details with the supplier or herbarium material. Allow a first season of close observation to establish its preferred light, soil and siting before committing to a permanent spot. Record what you learn against the name Pachyfragma macrophyllum for future reference.

Pachyfragma macrophyllum is a Pachyfragma species gardeners should check with suppliers and trial in a small area before wider planting.

Pachyfragma macrophyllum

Stanleya pinnatifida is a perennial herb in the Brassicaceae native to the southwestern United States. It favours full sun and thrives in well-drained, sandy or rocky soils with dry to medium moisture. Flowering occurs from June to August, offering a summer display. Use it in xeriscaping, rock gardens or native-plant schemes where drainage is sharp.

Desert plume (Stanleya pinnatifida) thrives in full sun on well-drained, sandy or rocky soils and flowers from June to August.

Stanleya pinnatifida

Desert plume | Stanleya pinnatifida

Thlaspi arvense 'Spring 32'PBR is a low-growing, compact annual/biennial in the Brassicaceae that forms basal rosettes of lance-shaped leaves. It reaches around 0.6 m and prefers full sun on neutral, moist but well-drained soils. Flowering occurs May to July. It suits south-facing, sheltered sites and containers used in alpine and rockery planting.

Thlaspi arvense 'Spring 32'PBR is a low-growing annual/biennial for south-facing rockeries and containers, flowering May to July.

Thlaspi, or pennycress, is a genus of herbs of temperate regions of the Eurasian continent. They occur in Central and South Europe, South-West Asia and two species are endemic to China.

Thlaspi arvense 'Spring 32'PBR

Field Pennycress | Thlaspi arvense 'Spring 32'PBR

Vesicaria utriculata is a species in the mustard family Brassicaceae that flowers in the UK from June to August. It belongs to the genus Vesicaria and is recorded under that binomial. Identification is most reliable when specimens are in flower, so look for flowering material between June and August. Botanical records and herbarium specimens provide authoritative reference material for confirmation.

Vesicaria utriculata is a Brassicaceae species that flowers in the UK from June to August.