Good substitute plants for impatiens include:
FLOWERS
Abutilon
Begonia
Tuberous Begonia
Browallia
New Guinea Impatiens
Tiarella
Torenia
FOLIAGE
Alternanthera
Begonia ‘Gryphon’
Coleus
Hypoestes
Plectranthus
Lamium
Perilla
Plectranthus
See Identification and Management of Downy Mildew on Impatiens
Controlling Downy Mildew in the Landscape
Links to various articles about impatiens downy mildew
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