Diascia rigescens is a perennial in the Scrophulariaceae native to South Africa, commonly called stiff twinspur. In the UK it flowers from June to September. It prefers full sun or partial shade on well-drained soil with moderate moisture and carries an H4 hardiness rating (average hardy). Place it at the front of borders or in containers to make the most of its summer flowering run.

Stiff twinspur (Diascia rigescens) is a South African perennial flowering June to September that suits borders and containers.

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

Diascia rigescens

Stiff twinspur | Diascia rigescens

Nemesia 'Tanith's Treasure' is a Nemesia cultivar in the Scrophulariaceae that flowers from June to September. It forms a well-branched, rounded mound with deciduous foliage and performs best in full sun on a south-facing, sheltered site. Plant in neutral loam that remains moist but is well drained. Suitable uses include edging, ground cover, mixed borders, containers and hanging baskets.

Nemesia 'Tanith's Treasure' flowers June to September and suits south-facing, sheltered sites in neutral loam.

Nemesia 'Tanith's Treasure'

Nemesia 'Tanith's Treasure' | Summer Nemesia

Ourisia macrocarpa is a perennial from the South Island of New Zealand, valued for its summer display of white flowers. It favours partial shade and a sheltered position, preferring north or east aspects. The plant needs moist, well-drained, humus-rich soil with an acidic to neutral pH. Flowering runs from June to August and it suits rock and alpine gardens.

Snowy Mountain Foxglove (Ourisia macrocarpa) flowers June to August and suits sheltered, north or east rock and alpine gardens.

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

Ourisia is a genus of flowering plants of the family Plantaginaceae, native to Andean South America, Tasmania or New Zealand.

Ourisia macrocarpa

Snowy mountain foxglove | Ourisia macrocarpa

Ourisia macrophylla is an herbaceous perennial in the family Scrophulariaceae, native to New Zealand. It produces a summer display, flowering from June to August. Best placed in partial shade, it favours moist, well-drained soil in a sheltered position. Suited to cool, damp corners of the garden where exposure is limited.

Ourisia macrophylla prefers partial shade and moist, well-drained soil and flowers from June to August.

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

Ourisia macrophylla

New Zealand Foxglove | Ourisia macrophylla

Phygelius capensis is a perennial shrub notable for its summer display of upright tubular blooms. It flowers in the UK from July to September. It prefers full sun or partial shade in fertile, well-drained soil kept evenly moist.

Cape figwort (Phygelius capensis) is a perennial shrub that produces tubular summer flowers in the UK from July to September.

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

Phygelius, common names Cape fuchsia or Cape figwort, is a genus of flowering plants in the family Scrophulariaceae, native to wet slopes and banks in southern Africa. They are evergreen shrubs often treated as perennials in colder climates.

Phygelius capensis

Cape figwort | Phygelius capensis

Scrophularia aquatica is a member of the figwort genus Scrophularia (family Scrophulariaceae) and shows the genus's diagnostic square stems and opposite leaves. Its open, two-lipped flowers form clusters at stem tips and appear in the UK from June to September. Species in this genus are known to support some Lepidoptera larvae and a number have traditional medicinal uses.

Figwort (Scrophularia aquatica) flowers in the UK from June to September and shows the square stems and opposite leaves typical of the genus.

The genus Scrophularia of the family Scrophulariaceae comprises about 200 species of herbaceous flowering plants commonly known as figworts. Species of Scrophularia all share square stems, opposite leaves and open two-lipped flowers forming clusters at the end of their stems.

Scrophularia aquatica

Figwort | Scrophularia aquatica

Scrophularia aquatica 'Variegata' is a perennial herb in the figwort family with variegated leaves that mark it out at pond margins. It favours consistently moist, well-drained soil and will take both partial shade and full sun. Flowering occurs from June to September. It is suited to water gardens, pond edges and moist borders.

Scrophularia aquatica 'Variegata' is a variegated figwort for pond edges and moist borders, flowering June to September.

Scrophularia aquatica 'Variegata'

Verbascum 'Cotswold Beauty' is a cultivar of the genus Verbascum in the family Scrophulariaceae, offered for its summer display. It flowers in the UK from June to September. Check the nursery label or supplier notes for specific site and soil requirements before planting.

Verbascum 'Cotswold Beauty' flowers in the UK from June to September, so check the supplier label for specific care and siting advice.

Verbascum 'Cotswold Beauty'

Mullein | Verbascum 'Cotswold Beauty'

Verbascum 'Golden Bush' is a perennial in the Scrophulariaceae family that flowers from June to September. It prefers full sun and well-drained soil and tolerates dry to medium moisture levels. Rated H5, it is hardy in typical UK gardens and will tolerate both sheltered and more exposed spots. Use it where an upright summer-flowering perennial is required, such as borders, rock gardens or containers.

Mullein (Verbascum 'Golden Bush') flowers June to September and prefers full sun and well-drained soil, ideal for borders, rock gardens or containers.

Verbascum is a genus of over 450 species of flowering plants, common name mullein, in the figwort family Scrophulariaceae. They are native to Europe and Asia, with the highest species diversity in the Mediterranean.

Verbascum 'Golden Bush'

Mullein | Verbascum 'Golden Bush'

Verbascum blat. 'Albiflora' is a mullein in the figwort family that produces an upright flowering spike arising from a basal rosette. It follows the genus habit of forming a dense rosette before sending up tall stems of five-petalled blooms that open from June to September. Leaves are spirally arranged and often densely hairy. The plant keeps a narrow, architectural presence and tolerates drier, free-draining soils.

Verbascum blat. 'Albiflora' produces tall flower spikes from June to September and tolerates dry, free-draining soil.

Verbascum is a genus of over 450 species of flowering plants, common name mullein, in the figwort family Scrophulariaceae. They are native to Europe, Africa and Asia, with the highest species diversity in the Mediterranean.

Verbascum blat. 'Albiflora'

Mullein | Verbascum blat. 'Albiflora'

Verbascum bomb. 'Polar Summer' is a cultivar of mullein that produces tall, narrow flower spikes over an extended season from June to September. It typically forms a dense basal rosette of leaves before sending up a conspicuous flowering stem. As with other mulleins, it tolerates dry soils and is valued for long, steady flowering. The plant belongs to the Scrophulariaceae family and sits within the Verbascum genus.

Verbascum bomb. 'Polar Summer' produces tall flower spikes from June to September and tolerates dry soils.

Verbascum bomb. 'Polar Summer'

Mullein | Verbascum bomb. 'Polar Summer'

Verbascum bombyciferum is a perennial herb in the genus Verbascum, valued for attracting pollinators. It flowers from June to September and provides a summer nectar source. Plant it in full sun on well-drained soil where conditions are dry to medium and sites are exposed.

Broussa mullein (Verbascum bombyciferum) flowers June to September and suits exposed, well-drained sites in pollinator or rock gardens.

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

Verbascum bombyciferum

Broussa mullein | Verbascum bombyciferum

Verbascum nigrum subsp. nigrum is a biennial or short-lived perennial in the genus Verbascum, notable for its upright spikes of yellow flowers with purple stamens. It forms clumps of leaves from which multiple flowering stems arise, reaching about 0.5–1.5 m tall. Plants are native to dry, open sites in temperate Europe and are grown ornamentally for their long summer display. Flowering occurs from June to September.

Black Mullein (Verbascum nigrum subsp. nigrum) is a biennial or short-lived perennial with yellow flower spikes that suits sunny, well-drained, calcareous.

Verbascum nigrum subsp. nigrum

Black Mullein (Verbascum nigrum subsp. nigrum) | Yellow

Verbascum olympicum is a perennial that reaches about 2 metres and flowers from June to September. It comes from Greece and Turkey and belongs to the Scrophulariaceae. Plant in full sun in well-drained soil with moderate moisture. Suited to pollinator gardens and the back of mixed borders.

Olympian mullein (Verbascum olympicum) flowers June to September and suits full sun, well-drained soil and borders or pollinator gardens.

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

Verbascum olympicum

Olympian mullein | Verbascum olympicum

Verbascum olympicum 'Album' is a named selection in the genus Verbascum, belonging to the Scrophulariaceae. It is grown for its summer flowering display. In the UK it flowers from June to September. Gardeners use the plant where a tall, flowering presence is required in the border.

Greek Mullein (Verbascum olympicum 'Album') flowers in the UK from June to September and belongs to the Scrophulariaceae family.

Verbascum olympicum 'Album'

Greek Mullein | Verbascum olympicum 'Album'

Verbascum phoeniceum is a perennial herbaceous plant in the Scrophulariaceae that produces purple-pink flowers from June to September. Native to central Europe and western Asia, it suits sunny positions on well-drained soil. It favours a neutral to alkaline pH and requires only moderate moisture, surviving typical UK winters as hardy (H5).

Purple mullein (Verbascum phoeniceum) produces purple-pink summer flowers from June to September and suits sunny, well-drained borders.

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

Verbascum phoeniceum

Purple mullein | Verbascum phoeniceum

Verbascum phoeniceum 'Gainsborough' is a perennial mullein in the Scrophulariaceae family that flowers from June to September. It favours a sunny position but will tolerate some afternoon shade. Plant in well-drained soil of neutral to alkaline reaction and keep soil moisture moderate. It is rated H5 for UK hardiness, so it will withstand typical winter conditions in most parts of the country.

Mullein (Verbascum phoeniceum 'Gainsborough') blooms June to September and prefers full sun or partial shade in well-drained, neutral to alkaline soil.

Verbascum phoeniceum 'Gainsborough'

Mullein | Verbascum phoeniceum 'Gainsborough'

Verbascum phoeniceum 'Lilac Domino' is a perennial mullein that produces purple-pink flower spikes from June to September. It favours full sun or partial shade in well-drained, neutral to alkaline soil with moderate moisture. Hardy to H5, it tolerates typical UK winter conditions. The flowers appear on upright spikes, giving summer vertical interest in the border.

Mullein (Verbascum phoeniceum 'Lilac Domino') bears purple-pink flower spikes from June to September and prefers full sun and well-drained neutral to.

Verbascum phoeniceum 'Lilac Domino'

Mullein | Verbascum phoeniceum 'Lilac Domino'

Verbascum phoeniceum 'Pink Domino' is a perennial mullein that produces purple-pink flowering spikes through the summer from June to September. It belongs to the family Scrophulariaceae and sits in the genus Verbascum. The plant prefers full sun or partial shade in well-drained soil and tolerates neutral to alkaline pH, demanding only moderate moisture.

Mullein (Verbascum phoeniceum 'Pink Domino') flowers from June to September and prefers full sun and well-drained, neutral to alkaline soil.

Verbascum phoeniceum 'Pink Domino'

Mullein | Verbascum phoeniceum 'Pink Domino'

Verbascum phoeniceum 'Rose Bouquet' is a perennial mullein cultivated for its rose‑pink flower spikes. It flowers June to September. The plant prefers full sun or partial shade and well‑drained neutral to alkaline soil with moderate moisture. It is rated H5 (hardy) and suits a sheltered site.

Verbascum phoeniceum 'Rose Bouquet' is a perennial mullein flowering June to September, ideal for borders and cut flowers in well-drained soil.

Verbascum phoeniceum 'Rose Bouquet'

Mullein | Verbascum phoeniceum 'Rose Bouquet'

Verbascum phoeniceum Cotswold varieties is a perennial herbaceous plant in the Scrophulariaceae that produces upright spikes of purple-pink flowers. It favours full sun on well-drained, neutral to alkaline soils and flowers from June to September. Suited to south-facing positions, it tolerates both sheltered and exposed sites and is winter-hardy to H5 in the UK.

Purple mullein (Verbascum phoeniceum Cotswold varieties) flowers June to September and prefers full sun on well-drained neutral to alkaline soil.

Verbascum phoeniceum Cotswold varieties

Purple mullein | Verbascum phoeniceum Cotswold varieties

Verbascum phoeniceum hybrids, 'Bridal Bouquet' is a perennial mullein in the Scrophulariaceae that flowers from June to September. It performs best in a south-facing, sheltered spot in full sun. The plant prefers well-drained, neutral to alkaline soil with moderate moisture and is rated H5 for UK gardens. Use it towards the middle or rear of borders and in cottage garden schemes.

Mullein (Verbascum phoeniceum hybrids, 'Bridal Bouquet') flowers from June to September and suits south-facing, sheltered borders in well-drained neutral.

Verbascum phoeniceum hybrids, 'Bridal Bouquet'

Mullein | Verbascum phoeniceum hybrids, 'Bridal Bouquet'

Verbascum vernale of gardens is a species of mullein in the figwort family Scrophulariaceae that produces a basal rosette of leaves before sending up tall flowering stems. Plants in the Verbascum genus are often biennial or perennial and typically bear five-petalled flowers. Flowering occurs from June to September. The genus is native to Europe and Asia, with greatest species diversity around the Mediterranean.

Mullein (Verbascum vernale of gardens) forms a basal rosette then tall flowering spikes that bloom from June to September.