Salvia 'Blue Lips' has aromatic, crinkly, dark green leaves topped with spikes festooned with two-lipped, open-mouthed, tubular, soft yellow flowers with purple-blue lips.

Salvia koyamae is a rare Japanese yellow sage with green, hairy foliage and yellow tubular flowers popular with pollinators.

Salvia madrensis 'Red Neck Girl' has maroon stems that are adorned later in the season with a compliment of yellow flowers.

An ornamental sage producing hundreds of intriguing mid yellow flowers emerging from peach buds all summer long!

Salvia Suncrest 'Lemon Light' is an ornamental sage producing lemon yellow flowers all summer long.

One of the most dramatic of pitcher plants with tall, lime green pitchers often to two feet tall.

Sarracenia flava var. cuprea is one of the most dramatic pitcher plants with tall, lime pitchers marked with red and copper.

Saxifraga fortunei 'Moe' has double, light yellow flowers arranged in large open panicles. Velvet saxifrages have attractive, thick, mounded foliage.

Sedeveria 'Markus' has forms apple green rosettes of attractive, pointed leaves.

Sedum ellacombianum 'Cutting Edge' is a mounding sedum with scalloped, spatula-shaped leaves with gold margins.

Sedum floriferum ‘Winter Mahogany’ is a creeping stonecrop with yellow flowers and green foliage that changes to burgundy red for autumn and winter.

Yellow blooms turn crimson on Sedum kamtschaticum 'Variegatum', making a pretty contrast to the cream-edged foliage.

Sedum makinoi 'Variegatum' has handsome round, light-green leaves with creamy edges.

Sedum ochroleucum 'Red Wiggle' is an outstanding stonecrop forming multi-colour carpets of cherry red, orange-red, and green.

Sedum pachyphyllum 'Rose' forms cute, short-trunked colonies with cylindrical, powder blue leaves like elongated jelly beans.

Sedum palmeri has great evergreen rosettes of broad, rounded, blue-green foliage and very pretty clusters of yellow flowers in mid- to late summer.

Sedum perezdelarosae has blue, keel-shaped leaves in tight rosettes in branching colonies.

Sedum reflexum 'Blue Moon' is a creeping stonecrop with narrow, blue-green foliage and yellow flowers in early summer.

Sedum reflexum 'Solar Spice' is a creeping stonecrop with narrow, yellow-orange foliage and yellow flowers in early summer.

Sedum reflexum 'Sundance' is creeping stonecrop with narrow, vivid yellow foliage and yellow flowers in early summer.