How to Grow Diascia 'Salmon Supreme'

Diascia 'Salmon Supreme'

Diascia barbareae 'Salmon Supreme'

flower

Diascia 'Salmon Supreme' is a tender perennial flowering plant prized for its delicate, snapdragon-like salmon-pink flowers that bloom prolifically throughout the growing season. This low-growing, mounding plant is popular for containers, hanging baskets, and garden borders, offering months of continuous color with minimal maintenance. It thrives in cool to moderate temperatures and appreciates consistent moisture and good air circulation.

Growing Conditions

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Sun: Full sun to partial shade; 6+ hours of direct sunlight daily, with afternoon shade in hot climates

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Water: Keep soil consistently moist but not waterlogged; water regularly during growing season, reduce watering in winter; tolerates moderate drought once established but performs best with regular moisture

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Spacing: 12 inches

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Days to maturity: 30-45 days to first flowers

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Planting depth: Surface sow seeds; transplants should be planted at same depth as nursery pot

Soil

Type: Well-draining fertile loam

pH: 6.0-7.0

Amendments:

Compost peat moss or coco coir perlite for drainage

Growing Zones

Find your zone →

Zones 9-11; grown as an annual or in containers in cooler climates

9a 9b 10a 10b 11a 11b

Growth Stages

Seedling

2-3 weeks

Tiny seedlings emerge with small oval cotyledons and begin developing true leaves within 1-2 weeks

Keep soil moist but not soggy; provide bright, indirect light; maintain warmth (65-70°F); thin seedlings or transplant to individual pots when first true leaves appear

Vegetative Growth

3-4 weeks

Plant develops bushy, spreading foliage with numerous stems creating a mounding habit; leaves are small, narrow, and bright green

Ensure adequate spacing for air circulation; pinch tips early to encourage branching; provide consistent moisture and balanced fertilizer; maintain cool temperatures (65-75°F) for best growth

Flowering

8-12 weeks or longer

Delicate salmon-pink snapdragon-like flowers appear in profusion along stems; flowers typically have two upper petals and three lower petals with distinctive markings

Deadhead spent blooms regularly to encourage continuous flowering; maintain consistent watering; apply balanced or slightly lower nitrogen fertilizer; ensure good air circulation to prevent mildew

Extended Bloom

4-8 weeks

Plant continues to produce abundant flowers throughout season if conditions remain favorable; in cool climates, blooming may slow in peak summer heat but resume in fall

Continue deadheading; provide afternoon shade if temperatures exceed 85°F; maintain consistent moisture; supplement with liquid fertilizer every 2-3 weeks

Dormancy/Decline

Variable, 2-4 months

In cold climates or at season's end, plant growth slows, flowering ceases, and foliage may deteriorate; in mild zones it may persist through winter

Reduce watering; apply light frost protection if needed in zones 9-10; can be overwintered indoors or treated as annual; some growers cut back by half and maintain dormant plants in cool greenhouse conditions

Companion Planting

Plan your garden →

Plant with:

Calibrachoa Bacopa Petunia Verbena Helichrysum Osteospermum Scaevola Nemesia

Avoid planting near:

Large vigorous plants that shade delicate diascias Plants requiring very dry conditions

Common Pests

Spray with insecticidal soap or neem oil; remove heavily infested leaves; improve air circulation; use yellow sticky traps
Ensure good air circulation; avoid overhead watering; spray with sulfur or potassium bicarbonate; remove infected foliage; apply fungicide if severe
Increase humidity; spray foliage with water to dislodge mites; apply miticide or neem oil if infestation is severe
Spray with strong water stream; apply insecticidal soap; use neem oil; encourage beneficial insects

Uses

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Container and Basket Displays

Household

'Salmon Supreme' excels in hanging baskets, window boxes, and container gardens where its trailing, mounding habit creates cascading displays of color. Its compact size and prolific blooming make it ideal for patios, balconies, and small spaces. [source]

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Cut Flower Arrangements

Craft

The delicate salmon-pink flowers are excellent for cutting and arranging in small vases or mixed fresh bouquets. The stems are sturdy enough for floral work despite their delicate appearance. [source]

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Pollinator Attraction

Wildlife

Diascia flowers attract bees, hoverflies, and other beneficial insects, making it a valuable addition to pollinator gardens and supporting local biodiversity. [source]

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Garden Borders and Edging

Household

The low-growing mounding habit makes 'Salmon Supreme' perfect for softening garden edges, creating color at the front of borders, or filling gaps between taller perennials. [source]

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Edible Flowers

Culinary

While not commonly consumed, the delicate flowers are technically edible and can be used as a garnish for desserts, salads, or cocktails, adding color and a slight floral note to dishes. [source]

Harvest Tips

Diascia is a flower, not typically harvested for food. Deadhead spent flowers regularly by pinching off bloom stems just below the flower cluster to encourage continuous flowering. Cut stems for fresh arrangements when flowers are fully open; they make excellent additions to small bouquets and will last 7-10 days in water.

Fun Facts

🌱 Diascia is named from the Greek word 'dis' (two) and 'askos' (sac), referring to the two distinctive sac-like pouches at the base of the upper petals that are unique to this genus.
🌱 'Salmon Supreme' was bred to emphasize the warm salmon-coral coloring and is particularly popular in British and European gardens where diascias thrive in the cool, moist summers.
🌱 Diascia is sometimes called 'Twinspur' in horticulture due to the distinctive twin spurs or pouches visible on the flowers, a characteristic that helps distinguish it from similar snapdragon-like flowers.

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