We have found 57 plants that meet your criteria.

Spurge ‘Euphorbia characias subsp. wulfenii’ Handsome tall evergreen with chartreuse flowers in spring £5.99 Buy
Price Pruned
Spurge ‘Euphorbia polychroma’ Vivid acid yellow flowers NOW £5.49 Buy
Spurge ‘Euphorbia Whistleberry Garnet’ Bold evergreen foliage £6.49 Buy
Price Pruned
Daylily ‘Hemerocallis citrina’ Star-shaped, lemon-yellow flowers NOW £5.49 Buy
Price Pruned
Daylily ‘Hemerocallis Golden Chimes’ Deep yellow, lily-like flowers NOW £5.49 Buy
Daylily ‘Hemerocallis lilioasphodelus’ A fragrant variety with bright yellow flowers £5.49 Buy
Daylily ‘Hemerocallis Stella De Oro’ a dwarf daylily with cheeful yellow flowers £5.99 Buy
Iris ‘Iris Good Show’ Unusual orange flowers £6.99 Buy
Tall Bearded Iris ‘Iris Supreme Sultan’ A large flowering iris £6.99 Buy
Red Hot Poker ‘Kniphofia Brimstone’ Dramatic spikes of yellow flowers £6.99 Buy
Price Pruned
Red Hot Poker ‘Kniphofia Little Maid’ Small variety with pale yellow flowers NOW £5.49 Buy
Golden Groundsel ‘Ligularia The Rocket’ Towering spikes of brilliant yellow flowers £5.49 Buy
West Country Lupin ‘Lupinus Tequila Flame’ Makes a great focal point £6.99 Buy
Paeony / Peony ‘Paeonia Claire de Lune’ Rare variety with single, lemon yellow flowers £32.99 Buy
Price Pruned
Sisyrinchium ‘Sisyrinchium striatum’ Cup shaped pale yellow flowers NOW £4.99 Buy
Mullein ‘Verbascum (Cotswold Group) Cotswold Queen’ Saucer-shaped soft-yellow flowers £5.99 Buy
Mullein ‘Verbascum (Cotswold Group) Gainsborough’ Saucer-shaped, soft yellow flowers £5.99 Buy