- Glaucidium palmatum in May
- Primula denticulata v. alba in May
- Heucherella 'Sweet Tea' in May
- Heucherella 'Brass Lantern' in May
- Saxifraga 'Volgeri' in May
- Malus 'Royalty' in May
- Phlox x procumbens 'Variegata' in May
- Phlox douglasii 'Apollo' in May
- Phlox x procumbens 'Variegata' in May
- Phlox subulata ? in May
- Primula florindae 'Red Shades' in May
- Primula denticulata in May
- Pulmonaria 'Rasberry Splash' in May
- Pulmonaria 'David Ward' in May
- Pulmonaria 'Rasberry Splash' in May
- Picea glauca var. albertiana 'JW Daisy's White' in May
- Corydalis flexuosa 'Purple Leaf' in May
- Corydalis flexuosa 'Blue Panda' in May
- Brunnera macrophylla 'Jack Frost' in May
- Gentiana pumila v. delphinensis in May
- Gentiana acaulis in May
- Acer palmatum 'Beni shigitatsu sawa' in May
- Epimedium x youngianum 'Be My Valentine' in May
- Epimedium grandiflorum 'Swallowtail' in May
- Rhododendron 'Boudoir' in May
- Sanguinaria canadensis 'Multiplex' in May
- Rhododendron 'Patty Bee'
- Rhododendron 'Ginards Pleasant White'
- Rhododendron 'War Dance'
- Acer palmatum 'Peaches and Cream' in May
- Acer palmatum 'Olsen's Frosted Strawberry' in May
- Acer palmatum 'First Ghost' in May
- Acer palmatum 'Olsen's Frosted Strawberry' in May
- Prunus 'Marion Javie' in May
- Cornus florida 'Rubra' in May
- Tulipa 'Lasting Love' in May
- Season - May (L3,K4)
- Corydalis buschii in May