Clustered Rose
Rosa pisocarpa
Rosaceae · broadleaf deciduous shrub · native
Last updated
Clustered rose (Rosa pisocarpa), also called swamp rose, is a broadleaf shrub in the Rosaceae family native to western North America from southern British Columbia to northern California. It reaches 8 ft tall and produces clusters of 2-10 deep pink flowers 1-2 cm across.
Clustered rose is hardy in zones 7a-8b and tolerates full sun to shade. Thirty-three diseases and 29 pests are documented. Detailed site preferences require further enrichment from authoritative sources.
Plant Profile
Size & Form
Height
8 ft
Site Requirements
Light
Full Sun to Shade
Hardiness
Zones 7a–8b
Ornamental Interest
Bloom Time
summer
Origin
Pacific Northwest native
Watch for this season
Powdery MildewHigh
Active Conidial Spread
RustHigh
Uredinial Stage (Summer)
Root Colonization Period
AphidHigh
Peak Population & Dispersal
+ 8 more — see full disease and pest lists below
Diseases: Regionally Documented (26)
Armillaria spp. — primarily A Armillaria Root Rot Bacterial Cane Blight Bacterial Leaf Spot and Blast Chlaropsis thielavioides Black Mold [NOTE: Diplocarpon rosae causes black spot on roses (Rosa... Black Spot Botrytis Bud and Twig Blight Two fungi Brand and Common Canker Cryptosporella umbrina (anamorph: Diaporthe umbrina) Brown Canker Bullhead Chemical Injury Rhizobium radiobacter (formerly Agrobacterium tumefaciens) Crown Gall Multiple obligate oomycetes (Peronosporaceae); species ar... Downy Mildew Several fungal (primarily Rosisphaerella rosicola/Cercosp... Leaf Spots, Miscellaneous Lime-induced Chlorosis Phytophthora spp. (P Phytophthora Root Rot Multiple obligate biotrophic fungi (Erysiphales: Erysipha... Powdery Mildew Pythium spp., Phytophthora spp., Rhizoctonia spp., Fusari... Replant Disease Prunus necrotic ringspot virus (PNRSV), Apple mosaic viru... Rose Mosaic Multiple genera (Melampsoridium, Thekopsora, Naohidemyces... Rust Verticillium dahliae Verticillium Wilt Blueberry mosaic virus and related viruses Virus Diseases Winter Injury Raspberry bushy dwarf virus and related viruses Virus Kalmusia coniothorium Brand canker Coniothyrium wernsdorffiae and Paraconiothyrium fuckelii Common canker Various plant-parasitic nematode genera Nematodes
Pests: Regionally Documented (22)
Aphidoidea Aphid Hyphantria cunea Fall webworm Cynipidae Gall wasp Megachile spp. Leafcutting bee Tortricidae Leafroller Cane maggot Otiorhynchus spp. Root weevil Merhynchites bicolor Rose curculio Endelomyia aethiops Roseslug Marmara spp. Rose stem miner Ceratina spp. Small carpenter bee Tetranychidae Spider mite Malacosoma spp. Tent caterpillar Schizura concinna Redhumped caterpillar Macrosiphum rosae Rose aphid Rose thrips Diplolepis rosae Rose galls Edwardsiana rosae Rose leafhopper Dasineura rhodophaga Rose midge Thysanoptera Thrips Chloridea virescens Tobacco budworm Diabrotica undecimpunctata Western spotted cucumber beetle
Data Maturity Structured Multiple sources. Expert review underway.