Helenium 'Double Trouble' has ruffly, double yellow flowers all summer.

Helenium 'El Dorado' has bright yellow flowers with a little blush of red on each petal for a unique effect.

Helianthus maximiliani is a towering perennial that can reach 9 feet high with spires of bright yellow daisies.

Helianthus 'First Light' has tall stems with narrow, fuzzy, linear leaves and masses of golden daisies in fall.

Helianthus tuberosus, Jerusalem artichoke or sunchoke, is a large perennial sunflower with edible tuberous roots.

Helianthus 'Lemon Queen' is an excellent border perennial with four foot tall stems topped with pale yellow daisies in summer.

Helianthus 'Suncatcher' is a dwarf perennial sunflower with large, yellow flowers and dark centres.

Helichrysum trilineatum SteppeSuns 'Hokubetsi' is a woody shrub with yellow flowers and silver foliage.

Heliopsis helianthoides 'Asahi' is a double form of the false sunflower with flowers that look like golden pompoms or marigolds.

Heliopsis helianthoides 'Bit of Honey' has semi-double, golden flowers and white leaves with dark green veins.

Heliopsis helianthoides ‘Sparkling Contrast’ has bright single orange petals with bright yellow tips.

Heliopsis 'Summer Night's has deep golden yellow flowers with deep mahogony centers atop dark red stems and red-tinged foliage.

Heliopsis helianthoides 'Summer Pink' has bright yellow daisies with orange-red centres on burgundy stems with pink and burgundy variegated foliage.

Heliopsis 'Sunstruck' has creamy white leaves with dark green veins and classic, long lasting, deep yellow daisies.

Heliopsis 'Bleeding Hearts' offers a dramatic colour break emerging in shades of fiery red and orange red.

Heliopsis 'Burning Hearts' boasts bicolour yellow and red daisies atop tall black stems with purple foliage.

'Summer Sun' sports large, semi-double, golden-yellow daisy flowers with a golden-brown centres.

Heliopsis 'Variegata Oriole' is a false sunflower with daisy-like yellow blooms with brown eyes and variegated foliage.

Heliopsis 'Yellow Spider' is a false sunflower with semi-double yellow flowers with red centres and dark red foliage and stems.

Blue-grey foliage with creamy white and yellowish flowers with peachy pink reverses - Helleborus 'Monte Cristo' is a multi-colour hellebore marvel.

Helleborus x hybridus Honeymoon California Dreaming has gorgeous, butter yellow flowers, one of the rarest colours in Lenten roses.

Helleborus Honeymoon Sandy Shores has pale apricot flowers with dark purple central flares and rosy pink reverses.

Helleborus Honeymoon Spanish Flare has light yellow flowers with maroon-red flares around the centre.

Helleborus Honeymoon Tropical Sunset has light yellow flowers dramatically detailed with red streaks and picotee edges.