Your search for Flowers begining with the letter H returned 4 items.
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Heliotrope.
Heliotropium arborescens 'Marine'. This fragrant pot plant produces blue flower clusters that rise from large green-purple leaves. Richly fragrant of spice and vanilla, it will brighten any winter room.Last Seed Source: www.ivygarth.com
Heliotrope, White.
Heliotropium arborescens 'Alba'. Sweetly scented, white flowers decorate upright plants. Foliage stays green unlike the almost purple-leaved 'Marine'. Good container plant. The most fragrant heliotrope.Hollyhock.
Alcea rosea 'Chaters Double Mix'. Biennial, short-lived perennial. Fully double blooms in a blend of scarlet, crimson, pink, rose, or yellow. Flowers appear the second year during early summer. on 6 foot tall spikes. Hollyhocks need some type of support to keep them from toppling after a hard rain.Last Seed Source: www.hpsseed.com
Hollyhock, Black.
Alcea rosea 'Nigra'. Biennial, short-lived perennial. Very dark purple, single flowers appear black. Flowers appear the second year on 6 foot tall spikes. I have found they need some type of support to keep them from toppling after a hard rain.Last Seed Source: www.seedsavers.org