Plant WitchPlants for zone 4
1181 plants hardy in USDA zone 4.
- Rocky Mountain Iris Iris missouriensis Wildflower
- Rocky Mountain Penstemon Penstemon strictus Wildflower
- Roman Chamomile Chamaemelum nobile Herb
- Roof Iris Iris tectorum Garden perennial
- Rose Clover Trifolium hirtum Legume
- Rose Hip Rosa rugosa Fruiting
- Rose Mallow Hibiscus moscheutos Wildflower
- Rose of Sharon Hibiscus syriacus Flowering shrub
- Rose Spirea Spiraea douglasii Flowering shrub
- Rosebay Rhododendron Rhododendron maximum Flowering shrub
- Rosinweed Silphium integrifolium Wildflower
- Rosy Pussytoes Antennaria rosea Creeping perennial
- Rosy Sedge Carex rosea Grass sedge
- Rough Blazing Star Liatris aspera Wildflower
- Roughleaf Dogwood Cornus drummondii Flowering tree
- Roundhead Bushclover Lespedeza capitata
- Roundhead Prairie Clover Dalea multiflora
- Roundleaf Ragwort Packera obovata Creeping perennial
- Royal Azalea Rhododendron schlippenbachii Flowering shrub
- Royal Penstemon Penstemon speciosus Wildflower
- Rubber Rabbitbrush Ericameria nauseosa Flowering shrub
- Rue Ruta graveolens Flowering shrub
- Rue Anemone Thalictrum thalictroides Wildflower
- Rupturewort Herniaria glabra Creeping perennial
- Russet Buffaloberry Shepherdia canadensis Berry
- Russian Sage Perovskia atriplicifolia Garden perennial
- Rusty Blackhaw Viburnum rufidulum Flowering shrub
- Rutabaga Brassica napus Root
- Rydberg's Penstemon Penstemon rydbergii Wildflower
- Rye Secale cereale Grain
- Sacred Lily Rohdea japonica Creeping perennial
- Sacred Lotus Nelumbo nucifera Garden perennial
- Saffron Crocus Crocus sativus Garden perennial
- Salsify Tragopogon porrifolius Root
- Sand Phlox Phlox bifida Creeping perennial
- Sassafras Sassafras albidum Herb
- Saucer Magnolia Magnolia × soulangeana Flowering tree
- Savanna Blazing Star Liatris scariosa
- Savin Juniper Juniperus sabina Creeping perennial
- Sawsepal Penstemon Penstemon glaber Wildflower
- Sawtooth Sunflower Helianthus grosseserratus Wildflower
- Scabland Penstemon Penstemon deustus Wildflower
- Scallion Allium fistulosum Allium
- Scaly Blazing Star Liatris squarrosa Wildflower
- Schisandra Schisandra chinensis Berry
- Scotch Rose Rosa spinosissima Flowering shrub
- Scouler's Willow Salix scouleriana Flowering shrub
- Sea Buckthorn Hippophae rhamnoides Berry
- Sea Kale Crambe maritima Brassica
- Sea Lavender Limonium platyphyllum Garden perennial
- Sea Thrift Armeria maritima Garden perennial
- Searls' Prairie Clover Dalea searlsiae
- Sego Lily Calochortus nuttallii Wildflower
- Sensitive Fern Onoclea sensibilis Fern
- Serbian Bellflower Campanula poscharskyana Creeping perennial
- Serviceberry Amelanchier alnifolia Berry
- Shadblow Serviceberry Amelanchier canadensis Flowering tree
- Shagbark Hickory Carya ovata Nut
- Shallot Allium cepa var. aggregatum Allium
- Sharp-Lobed Hepatica Hepatica nobilis var. acuta Wildflower
- Sharpleaf Penstemon Penstemon acuminatus Wildflower
- Shasta Daisy Leucanthemum × superbum Garden perennial
- Sheep Fescue Festuca ovina Creeping perennial
- Sheep Laurel Kalmia angustifolia Flowering shrub
- Shining Willow Salix lucida Flowering shrub
- Shirley Poppy Papaver rhoeas Garden annual
- Shooting Star Dodecatheon meadia Wildflower
- Shore Juniper Juniperus conferta Creeping perennial
- Short's Aster Symphyotrichum shortii Wildflower
- Showy Colchicum Colchicum speciosum Garden perennial
- Showy Fleabane Erigeron speciosus Wildflower
- Showy Goldeneye Heliomeris multiflora Wildflower
- Showy Goldenrod Solidago speciosa Wildflower
- Showy Lady's Slipper Cypripedium reginae Wildflower
- Showy Milkweed Asclepias speciosa Wildflower
- Showy Stonecrop Hylotelephium spectabile Succulent
- Showy Ticktrefoil Desmodium canadense Legume
- Shrubby Cinquefoil Dasiphora fruticosa Flowering shrub
- Siberian Barren Strawberry Geum ternatum Creeping perennial
- Siberian Bugloss Brunnera macrophylla Creeping perennial
- Siberian Catmint Nepeta sibirica Garden perennial
- Siberian Cypress Microbiota decussata Creeping perennial
- Siberian Iris Iris sibirica Garden perennial
- Siberian Squill Scilla siberica Bulb
- Siberian Wallflower Erysimum × marshallii Wildflower
- Sicklekeel Lupine Lupinus albicaulis Wildflower
- Sidebells Penstemon Penstemon secundiflorus Wildflower
- Sideoats Grama Bouteloua curtipendula Grass
- Sieber's Crocus Crocus sieberi Garden perennial
- Siebold's Hosta Hosta sieboldiana Creeping perennial
- Siebold's Primrose Primula sieboldii Wildflower
- Silky Aster Symphyotrichum sericeum Wildflower
- Silky Dogwood Cornus amomum Flowering shrub
- Silky Lupine Lupinus sericeus Wildflower
- Silky Prairie Clover Dalea villosa
- Silky-Leaf Woadwaxen Genista pilosa Creeping perennial
- Silver Buffaloberry Shepherdia argentea Berry
- Silver Sage Salvia argentea
- Silver Sedge Carex platyphylla Grass sedge
- Silverleaf Phacelia Phacelia hastata Wildflower
- Silvermound Artemisia schmidtiana Creeping perennial
- Silverweed Argentina anserina Creeping perennial
- Silvery Lupine Lupinus argenteus Wildflower
- Singleleaf Pinyon Pinus monophylla Nut
- Singleseed Juniper Juniperus squamata Low shrub
- Siskiyou Lewisia Lewisia cotyledon Wildflower
- Sitka Willow Salix sitchensis
- Skunkbush Sumac Rhus trilobata Low shrub
- Sky Blue Aster Symphyotrichum oolentangiense Wildflower
- Slender Cinquefoil Potentilla gracilis Wildflower
- Slender Deutzia Deutzia gracilis Flowering shrub
- Small Camas Camassia quamash Root
- Small Yellow Foxglove Digitalis lutea Wildflower
- Small-Flowered Penstemon Penstemon procerus Wildflower
- Smoke Tree Cotinus coggygria Flowering shrub
- Smooth Beardtongue Penstemon laevigatus
- Smooth Blue Aster Symphyotrichum laeve Wildflower
- Smooth Hydrangea Hydrangea arborescens Flowering shrub
- Smooth Rose Rosa blanda Flowering shrub
- Smooth Sumac Rhus glabra Fruiting