Many gardener grow herbs primarily for culinary or medicative uses . Some herbs , however , go equally well as ornamental garden plant and bring in a range of a function of blue shades to the garden pallet . Many of them blossom in summer , at just the good time to bring a cooling accent to the landscape painting . In tender climates , some herbs with blue flowers grow as perennial and produce leaves that are available for cook all year long .
Borage
Borage ( Borago officinalis ) is a sprawl annual herb aboriginal to the Mediterranean . Reaching as high as 3 feet , and as wide as 18 in , borage has heavy , greyish - green leaves . Their cucumber - similar taste makes them a good increase to salad , cold drink or cooked Green . Dried leaves , however , are tasteless . From June to August , the plant ’s branch have pedicel ( stalks ) bearing drooping , ace - shaped blue flowers . Borage prefer full Lord’s Day to partial shade and fertile , well - drain territory . Sow seeds in the outpouring . Mature plants will self - sow and return each twelvemonth .
Hyssop
Like Borago officinalis , Hyssopus officinalis ( Hyssopus officinalis ) is native to the Mediterranean . This perennial is hardy to wintertime temperatures as low as negative 30 degrees F. Up to 2 metrical foot high and 18 inch astray , it has an upright , bushy habit and fragrant , narrow , showy - green leaves . From July to September , hyssop has dense spikes of blue - violet flowers . The lobed , fragrant bloom draw butterfly stroke and bee . Hyssop leaves are traditional flavoring for meat , stews , salads and sauce . Hyssop oil flavors Chartreuse liqueur . Use this herb in herbaceous plant or rock gardens , as a specimen plant , grouped in hedges or in containers . It likes a sunny to partially shady locating – afternoon nuance in hot place – with middling , well - drained territory . Rich loam and regular watering are serious , but plants can handle ironic , sandy , infertile soil . Sow seed in spring and prune plants back after flowering . Like borage , hyssop will self - sow .
Rosemary ‘Arp’
Rosemary ( Rosmarinus officinalis ) bear wintertime temperature as blue as zero degrees F. In mild winter climates , it can farm 6 feet high and 4 feet wide . It ’s an one-year in cold areas . Dried or fresh , its aromatic , acerate leaf - fine immature leaves are a culinary staple . They flavor vegetable , meat , fish , stews , vinegar , butter and adust goods . Oil of rosemary is a perfume and toiletry ingredient . Plants have petite , fragrant bloodless or wan down flowers on old growth . ' Arp , ' a rosemary variety native to Texas , has dark spicy booms . Where it ’s winter hardy , use rosemary in herb gardens , borders or as a foundation planting or hedge . Shape annual Rosmarinus officinalis produce in containers as a topiary . Give plant full sun and short , averagely moist , well - drain soil . They ache in weighty clay , and seldom survive wet wintertime roots .
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