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For Oregon gardens, these 28 shrubs and groundcovers are documented by Oregon State University Extension as candidates for low-water planting or summer heat and drought preparation. They are not a universal planting list: western, central and eastern Oregon differ, and a plant’s sun, soil, drainage and establishment needs matter. Use the profiles below to shortlist plants, then confirm local fit with your Extension service or a knowledgeable regional nursery.
“Drought-tolerant” does not mean “never water.” Newly planted specimens need help establishing roots, and even established plants can suffer during prolonged heat or drought.
How to use this list
The 28 plants below come from Oregon State University Extension’s Oregon-wide low-water shrub profiles and its Oregon summer heat and drought preparation recommendations. The care conditions and hardiness information are those OSU supplies; they are not guarantees for every cultivar or site.
Choose for your actual conditions, not just the plant label. OSU notes that species from Mediterranean climates may suit western Oregon, while natives from the Intermountain West may be better candidates in central and eastern Oregon. Native status alone does not establish drought tolerance. Compare mature size, sun exposure, drainage, winter hardiness and water needs, and seek local guidance before planting. OSU Extension’s water-efficient landscaping guidance explains regional matching.
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- Contains the following - Common Name (Scientific Name): Bachelor's Button (Centaurea cyanus), Siberian Wallflower (Cheiranthus allionii), Shasta Daisy (Chrysanthemum maximum), Plains Coreopsis (Coreopsis tinctoria), Sweet William (Dianthus barbatus), African Daisy (Dimorphotheca aurantiaca), Purple Coneflower (Echinacea purpurea), California Poppy (Eschscholzia californica), Perennial Gaillardia (Gaillardia aristata), Indian Blanket (Gaillardia pulchella)
- Showy Baby's Breath (Gypsohila elegans), Spurred Snapdragon (Linaria maroccana), Blue Flax (Linum lewisii), Sweet Alyssum (Lobularia maritima), Evening Primrose (Oennthera lamarckiana), Corn Poppy (Papaver rhoeas), Rocky Mountain Penstemon (Penstemon strictus), Prairie Coneflower (Ratibida columnifera), Black Eyed Susan (Rudbeckia hirta), Gloriosa Daisy (Rudbeckia hirta), Catchfly (Silene armeria)
10 low-water shrubs for Oregon
OSU Extension’s Oregon-wide low-water shrub list provides the following size, seasonal and site details. Hardiness zones are as listed by OSU; check the selected species or cultivar for local suitability.
1. Cinquefoil (Potentilla fruticosa)
A compact deciduous shrub, about 3 feet tall and 5 feet wide, with yellow flowers from June until frost. It prefers full sun but tolerates light shade and is listed hardy to Zone 2.
2. Flowering currant (Ribes sanguineum)
This shrub reaches about 10 feet tall by 5 feet wide. Dark-pink flower clusters appear in May and June, attracting hummingbirds and butterflies. It grows in full to partial sun and is listed hardy to Zone 5.
3. Globe blue spruce (Picea pungens ‘Globosa’)
A slow-growing conifer that matures at 5–6 feet. Full sun gives the best color; OSU lists it hardy to Zone 2.
Rank #2
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4. Manzanita (Arctostaphylos)
Evergreen shrubs range from 2 to 12 feet tall depending on selection. Twisting mahogany-colored bark and white-to-pink winter or early-spring flowers provide seasonal interest. Hardiness varies by species and cultivar, so choose locally.
5. Ninebark (Physocarpus opulifolius)
A 6–10-foot deciduous shrub with white flower domes in early summer, peeling bark and fall color. OSU highlights ‘Dart’s Gold’ and ‘Diablo’ and lists the species hardy to Zone 2.
6. Japanese spiraea (Spiraea japonica ‘Little Princess’)
This compact mound grows about 3 feet tall and 6 feet wide. Pink summer flowers attract pollinators. It suits full sun and is listed hardy to Zone 4.
7. Russian sage (Salvia yangii)
Expect a 3–5-foot shrub with fragrant gray-green foliage and airy lavender flower spikes from midsummer into fall. It prefers full sun and is listed hardy to Zone 4.
Rank #3
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8. Serviceberry (Amelanchier)
Depending on species, this shrub reaches 6–10 feet. It offers white early-spring flowers, edible purple-red berries and fall color, and prefers full sun. OSU lists it hardy to Zone 2.
9. Snowberry (Symphoricarpos albus)
About 5 feet tall by 6 feet wide, snowberry has small spring blooms and white fall berries. OSU notes its wildlife value; it grows in full to partial sun and is listed hardy to Zone 3.
10. Wayfaring tree (Viburnum lantana ‘Mohican’)
This rounded deciduous shrub grows about 7 feet tall by 8 feet wide. Spring flower clusters are followed by fruit that changes from pink to red to black, with deep-purple fall color. It tolerates full to partial sun and is listed hardy to Zone 3.
18 groundcovers and shrubs for summer heat and drought
OSU Extension’s summer preparation guidance includes the following plants for Oregon gardens. The source identifies two as groundcovers and six as shrubs; the remaining ten are the low-water shrub selections above that also appear in OSU’s heat-and-drought recommendations.
Rank #4
- Cross-Zone Vibrant Wildflower：A perennial herb with tall spikes (30-60cm tall), Texas Bluebonnet bursts with dense flower clusters from spring to summer, edged with white for striking contrast. Thrives in diverse climates, from temperate gardens to subtropical meadows.
- Planting Tips: Sow seeds in spring or fall when temperatures remain steady between 15-25°C (59-77°F). Soak seeds for 12-24 hours or lightly scarify the seed coat before planting for improved germination.
- Drought-Tolerant : This variety is highly drought-tolerant, making it ideal for low-water gardens or arid regions with minimal irrigation needs.
- Planting Method: Plant in well-draining sandy or gravelly soil with full sun exposure (at least 6 hours daily). Avoid overwatering to prevent root rot.
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Groundcovers
- 11. Point Reyes ceanothus (Ceanothus gloriosus): Listed by OSU as a groundcover for summer heat and drought preparation.
- 12. Carpet broom (Genista pilosa): Also listed as a groundcover.
Shrubs
- 13. Dwarf strawberry bush (Arbutus unedo ‘Compacta’): Included in OSU’s shrub recommendations for summer heat and drought.
- 14. Wild lilac (Ceanothus ‘Victoria’): Listed as a shrub for these conditions.
- 15. Rockrose (Cistus × hybridus): Included among OSU’s shrub recommendations.
- 16. Sunrose (Helianthemum nummularium): Listed as a shrub for summer heat and drought preparation.
- 17. Flowering currant (Ribes sanguineum): Appears in both OSU lists; see its profile above for size, bloom period and wildlife value.
- 18. Lavender (Lavandula spp.): OSU describes lavender as a good drought-tolerant plant that survives summer heat and drought.
Other low-water shrubs also named in OSU’s heat-and-drought guidance
These ten plants are already profiled above and round out the 28 distinct selections across the two OSU lists: cinquefoil, globe blue spruce, manzanita, ninebark, Japanese spiraea ‘Little Princess’, Russian sage, serviceberry, snowberry and wayfaring tree ‘Mohican’, along with flowering currant, which is counted once in the list.
OSU also maintains a Western Oregon landscape collection of plants grown without summer irrigation. The Department of Horticulture has evaluated plants in Aurora, Oregon, since 2000. The collection includes California lilac, rockrose, manzanita, spider flower and groundcover shrub groups, but its summary does not provide named cultivar results or trial statistics. It is not evidence that every plant succeeds without supplemental water in every garden.
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Water for establishment, then adjust to the plant
Do not leave new plantings to fend for themselves. OSU’s sunny-border guidance recommends enough water during the first two years to encourage healthy roots; listed plants have different irrigation needs. Increase watering frequency or duration if leaves wilt, curl or look dull. Young and shallow-rooted plants dry faster than established plants. OSU’s native-plant sunny-border guidance provides establishment advice.
Water deeply and at a useful time
OSU recommends watering early in the morning and, when watering is needed, doing it infrequently and deeply rather than giving plants a light watering every day. Its 2025 summer preparation guidance gives 8–10 inches as a target watering depth. A soaker hose around a tree’s root zone can deliver water where it is needed. Adapt the guidance to soil, weather, plant and local water rules. See OSU’s summer heat and drought preparation advice.
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- [Color-Changing Flower Clusters] Produces rounded clusters of small tubular flowers that shift colors as they mature. Different colors appear on the same plant at once—creating a multi-toned display. Blooms continuously from late spring through fall.
- [Heat and Drought Tolerant] Thrives in hot, sunny conditions with minimal water once established . Perfect for low-maintenance gardens, xeriscaping, and coastal areas. Tolerates salt spray and poor soils.
- [Versatile Evergreen Shrub] Reaches 12-24 inches with spreading habit. Ideal for borders, containers, hanging baskets, and ground cover.
- [Butterfly and Hummingbird Magnet] Highly attractive to butterflies, hummingbirds, and bees throughout the blooming season . A top choice for pollinator gardens and wildlife-friendly landscapes. Provides essential nectar from summer to frost.
- [Sun and Soil Needs] Requires full sun with well-drained, sandy or loamy soil . Seeds germinate slowly—soak in warm water for 24 hours before sowing. Sow on surface, press gently. Maintain 70-75°F; germination 6-8 weeks. Hardy in zones 8-11; grow as annual elsewhere.
Mulch to slow moisture loss, not to replace irrigation
OSU recommends a 3–5-inch layer of bark chips or arborist trimmings in its 2025 summer preparation guidance. Mulch reduces evaporation and runoff and can improve soil, but it does not eliminate irrigation for shallow-rooted or drought-sensitive plants. Keep watering according to the plants’ needs. OSU’s woody-ornamental mulch publication explains the benefits and limits.
Group plants by light and water needs
Place plants with similar sun and irrigation requirements together so care is easier to tailor. Improve moisture storage with organic matter where appropriate, while accounting for drainage and the needs of the particular plant. A species suited to one Oregon region or soil may struggle in another.
Recognize heat stress and reduce extra stress
Oregon State University Extension’s heat-stress guidance, published in 2021 and reviewed in 2026, says most plants grow best at 59°–86°F. When temperatures above 90°F persist, growth slows and some plants show stress. Above 104°F, many plants survive but show stress depending on species, maturity, drought and wind. Symptoms can include leaf rolling or cupping, wilting, sunscald and flower or fruit drop. Deep watering is preferable to shallow watering; mulch can moderate soil moisture loss and temperature swings. During extreme heat, defer transplanting, pruning and fertilizing. Shade may help container plants. Read OSU’s heat-stress guidance for plants.
Check containers more often
Pots dry faster than in-ground beds, so inspect container plants frequently and move them to a shadier location during heat waves if appropriate. Drip systems and soaker hoses can direct water close to roots and reduce evaporation. OSU’s summer preparation page includes these container and watering recommendations.
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Quick Recap
Make the final selection for your site
- Confirm regional fit: Use Oregon-specific guidance for an Oregon garden and seek local Extension advice elsewhere.
- Check mature size: Allow for the listed height and spread, especially for larger shrubs such as flowering currant and ninebark.
- Match sun and hardiness: Follow the profile’s sun preference and verify the selected species or cultivar for your site.
- Plan establishment care: Choose plants you can water while roots develop, then adjust to actual conditions rather than assuming all mature plants need the same amount.
- Decide whether the site is a bed or a container: Containers need closer moisture checks during hot weather.
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