OPALS - Ogren Plant Allergy Scale

Balkan Clary 'Caradonna'

Salvia nemorosa 'Caradonna'

Banksia Rose

Rosa banksiae

Bearded Iris

Iris × germanica

Bugle 'Catlin's Giant'

Ajuga reptans 'Catlin's Giant'

Catmint 'Six Hills Giant'

Nepeta 'Six Hills Giant'

Choisya 'Aztec Pearl'

Choisya × dewitteana 'Aztec Pearl'

Cranesbill 'Orion'

Geranium 'Orion'

Dusky Cranesbill 'Lily Lovell'

Geranium phaeum 'Lily Lovell'

Echeveria

Echeveria spp.

False Indigo

Baptisia australis

Feather Reed Grass 'Overdam'

Calamagrostis × acutiflora 'Overdam'

Fir

Abies spp.

Golden Oats

Stipa gigantea

Helen's Flower

Helenium 'Sahin's Early Flowerer'

Hosta

Hosta spp.

Japanese Snowball 'Mariesii'

Viburnum plicatum f. tomentosum 'Mariesii'

Jerusalem Sage

Phlomis italica

Lamb's Ear 'Silver Carpet'

Stachys byzantina 'Silver Carpet'

Masterwort

Astrantia major

Nemesia

Nemesia spp.

Okra

Abelmoschus esculentus

Peace Lily

Spathiphyllum spp.

Pearlbush 'The Bride'

Exochorda × macrantha 'The Bride'

Penstemon 'Andenken An Friedrich Hahn'

Penstemon 'Andenken an Friedrich Hahn'

Pineapple Flower

Eucomis spp.

Red Barrenwort

Epimedium × rubrum

Red Guelder Rose

Viburnum opulus 'Roseum'

Rose

Rosa 'Cecile Brunner'

Rose 'Iceberg'

Rosa 'Iceberg'

Rudbeckia 'Goldsturm'

Rudbeckia fulgida var. sullivantii 'Goldsturm'

Sacred Bamboo

Nandina domestica

Siberian Bugloss 'Jack Frost'

Brunnera macrophylla 'Jack Frost'

Snowy Mespilus

Amelanchier × lamarckii

Soft Caress Mahonia

Berberis ganpinensis 'Soft Caress'

Spiny Bear's Breeches

Acanthus spinosus

Tulip Tree

Liriodendron tulipifera

Wallflower 'Bowles's Mauve'

Erysimum 'Bowles's Mauve'

Willow-Leaved Sunflower

Helianthus salicifolius

Winter-Flowering Cherry 'Autumnalis'

Prunus x subhirtella 'Autumnalis'