Answer: Geraniums and peonies come to mind, but you have many other choices:
Achillea x 'Fanal' - Cherry red flowers have gold centers nice contrast in the blooms. Plants grow 30" tall.
Achillea x 'Fireland' - Brick red flowers when new that fad to a creamy yellow with age. Plants grow 36" tall
Armeria maritima 'Dusseldorf Pride' - Not really red- but a lavender red. Plants flower at 6-12" tall over hummocks of grassy like leaves starting in mid spring.
Epimedium x rubrum - "Barronwort". Plants have red veined and mottled foliage in May and June. grow in a shady place, will take root compition. Rosy red flowers with milky yellow centers.
Euphorbia amygdaloides 'Rebra'
Euphorbia griffithii 'Dixter'
Euphorbia griffithii 'Fireglow'
Fragaria x 'Lipstick' - Rose-red/ ornge flowers over strawberry type short 3-7" tall creeping plants. Full sun, use as a ground cover. Blooms on and off throughout the summer.
Imperata cylindrica 'Red Baron' - "Japanese Blood Grass"
Bergenia cordifolia 'Rotblum' - Red flowers over large bronze leaves in winter-early spring. Plants grow 10" tall.
Bergenia x 'Ballawlay'
Bergenia x schmidtii - A soft red that blooms very early.
Monarda x 'Gardenveiw Scarlet' - Fire engine red flowers on 30" tale stems, Mildew resistant.
Monarda x 'Squaw' - A nice red, mildew resistant, growing 30" tall.
Phelypaea tournefortii - A parisite on Achillea and Tanacetum. Flowers in late June with red flowers and black throats.
Pulmonaria rubra - Clump forming plants that have reddish flowers early in spring. Will grow in moist soil.
Pulsatilla vulgaris 'Rubra' - A few diffrent shades of red on this spring blooming plant. flowers have yellow stamens. Plants have fuzzy stems and leaves and grow 6-8" tall. they need a chalky soil and do not like to have wet feet.. Zones 5-7
Sedum x 'Autumn Joy' - Plants have large flat flower heads in fall that turn from light rust red to dried blood red in late fall. flowers persist in their color into mid winter. Good easy plant for full sun or semi shade. Plants grow 15" tall.
Hope this list gives you a few ideas!
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