Introduction
Plant Selection
Hardy, Semi-hardy, Tender
Heat and
Drought Tolerant
Shade Tolerant Annuals
Fragrant Annuals
Ornamental Foliage
Climbing Annuals
Hanging Baskets
Cut Flowers
Planting
Starting Plants
Maintenance
Insects Problems
Disease Problems
Introduction
Plant Selection
Plant Dimension Characteristics
Specific Site Conditions
Classification by Bloom Periods
Perennials That Attract Wildlife
Planting
Starting Plants
Care and Maintenance
Introduction
Plant Selection
Planting Bulbs
Purchasing Bulbs
Care & Maintenance
Introduction
Plant Selection
Mature Size
Grasses for Specific Uses
Planting Ornamental Grasses
Obtaining Plants
Care & Maintenance
Introduction
Container Selection
Soil Mixes
Container Placement
Plant Selection
Plant Care
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Heat and Drought Tolerant Annuals
 Some annual flowers can withstand hot, dry growing conditions and still provide attractive foliage and/or flowers. These plants may find their best use in the warm valleys of southwestern Idaho, though they will grow well in many other places in the state.
| Common Name |
Scientific Name |
Regional Adaptation |
| Amaranth, (Love Lies Bleeding, Joseph’s Coat) |
Amaranthus spp. |
N, SW, SC, SE, HA |
| California Poppy |
Eschscholzia californica |
N, SW, SC, SE, HA |
| Celosia (Cockscomb) |
Celosia cristata |
N, SW, SC, SE |
| Dusty Miller |
Senecio cineraria |
N, SW, SC, SE, HA |
| Four-O'clock |
Mirabilis jalapa |
N, SW, SC, SE |
| Gaillardia (Annual Blanket Flower) |
Gaillardia pulchella |
N, SW, SC, SE, HA |
| Gazania |
Gazania rigeas |
N, SW, SC, SE, HA |
| Larkspur |
Delphinium ajacis |
N, SW, SC, SE, HA |
| Moss Rose |
Portulaca grandiflora |
SW, SC, SE |
| Phlox |
Phlox drummondii |
N, SW, SC, SE, HA |
| Rudbeckia |
Rudbeckia hirta |
N, SW, SC, SE, HA |
| Salvia |
Salvia spp. |
N, SW, SC, SE, HA |
| Sunflower (ornamental) |
Helianthus annuus |
N, SW, SC, SE, HA |
| Zinnia |
Zinnia elegans |
N, SW, SC, SE |
Key to regional adaptation notes:
N = Northern Idaho valley locations in USDA zones 5 & 6, Moscow to Sandpoint.
SE = Southeastern Idaho valley locations in USDA zones 3 & 4 from Rexburg to Pocatello. SC = South-central Idaho Magic Valley locations in USDA zones 4 & 5, Burley and Twin Falls.
SW = Southwestern Idaho Treasure Valley locations in USDA zones 5 & 6, Boise area (also Lewiston).
HA = High altitude (>5,000 ft) areas of central, southeastern Idaho and similar locations elsewhere.
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