Ferula assa-foetida, commonly known as asafetida or devil's dung, is a tall, herbaceous perennial belonging to the Apiaceae family. It features broad, pinnately divided leaves and produces compound umbels of small flowers in spring and summer. This plant thrives in full sun with a south-facing, sheltered aspect, favouring well-drained, neutral loam soils. Hardy to UK zone H5, it is best grown as a specimen or architectural feature, requiring watering during establishment and propagated by seed or division.

Ferula assa-foetida is a tall herbaceous perennial with broad leaves and spring-summer umbels, perfect as a specimen or architectural feature in full sun.

Ferula assa-foetida

Ferula communis, the giant fennel, is a species of flowering plant in the carrot family Apiaceae. It is related to the common fennel (Foeniculum vulgare), which belongs to the same family. Ferula communis is a tall herbaceous perennial plant. It is found in Mediterranean and East African woodlands and shrublands. It is native to Albania, Algeria, Baleares, Canary Is., Corse and other regions. Mature plants reach roughly 2.5-4 metres tall and 0.5-1 metres wide, carrying deciduous foliage. In the garden it prefers full sun and most soil types. It tolerates soil of any pH, well-drained conditions and south-facing, west-facing and east-facing aspects.

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

Ferula communis

Ferula communis (3 diff forms) is a tall herbaceous perennial in the Apiaceae, notable for its sizeable architectural stems. It belongs to the genus Ferula and has a long history of human use, from food to resin extraction. Flowering in the UK occurs June to August. Some regional forms contain toxins, so handling and grazing should be approached with care.

Giant Fennel (Ferula communis (3 diff forms)) is a tall herbaceous Apiaceae that flowers June to August and has a long history of resin and culinary use.

Ferula communis (3 diff forms)

Giant Fennel (Ferula communis (3 diff forms)) | Apiaceae

Ferula glauca is a species in the genus Ferula, within the carrot family Apiaceae. It produces its flowers from June to August. Specific site, soil and hardiness details vary by provenance, so consult the plant label or supplier for exact requirements. Use those notes to decide placement and care in your garden.

Ferula glauca flowers from June to August; check the plant label or supplier notes for precise site, soil and hardiness guidance.

Ferula glauca

Ferula glauca (Apiaceae) | Flowers June to August

Ferula tingtitana (coll. Gibraltar) is a member of the genus Ferula in the carrot family Apiaceae and represents material collected in Gibraltar. It bears umbrella-like flowerheads composed of numerous small yellow florets and flowers in the UK from June to August. The stems are characteristically stout and hollow, carrying finely divided leaves and terminal umbels. This accession will appeal to those interested in Mediterranean umbellifers and architectural herbaceous plants.

Ferula tingtitana (coll. Gibraltar) is a Ferula (Apiaceae) accession that flowers in the UK from June to August.