Volcano® Lilac Splash

The Volcano® series of fragrant, abundantly-flowering, compact Phlox has been bred for high levels of natural disease-tolerance. This is wonderful news for Phlox fans, who until now have often had to deal with powdery mildew when growing other Phlox varieties.Volcano Lilac Splash Phlox (CU8)


Volcano® Phlox Lilac Splash is a compact plant that grows to 24-28 inches high and has masses of bi-color white and lilac flowers on sturdy upright stems. As with all the Volcano® Phlox series, Volcano® Phlox Lilac Splash is cold hardy to zone 4, but performs equally well up to zone 10.


Key Features

  • Spectacular bi-color white and lilac blooms
  • Masses of large, fragrant flower clusters
  • Compact and low-growing with sturdy stems
  • Flowers from June through September
  • Ideal in garden beds, borders and containers
  • Grow in full sun or partial shade
  • Superior mildew tolerance
  • Suitable in USDA zones 4-10

Suggested Uses

Ideal summer color for planting in garden beds and borders and container plantings. Excellent in commercial landscapes.


Growth Habit

Compact, branching. Basal growth, branching habit. Upright clump with strong upright stems that don’t require staking.


Plant Size

When mature, 24- to 28-inches tall, up to 24-inches wide.


Flower Size

Up to 1-inch in diameter.


Mature Height

24-28 inches tall.


Mature Width

24 inches wide.



Plant 16 to 18-inches apart to help natural tolerance to mildew.



Hardy in USDA zones 4 through 10.


Flowering Period

Flowers early Summer until Fall. To prolong blooming, cut back by 2/3rds after first flowering.


Number Of Flowers

Large, multi-branched flower clusters, comprised of up to 125 flowers or more per stem.


Flower Color

Bi-color white and lilac flowers.



Pleasant fragrance.



Narrow, pointed lance-shaped leaves up to 5-inches long.



No pinching or pruning necessary in the home garden.  However, cutting back or deadheading after 1st bloom will encourage a 2nd bloom cycle.



Phlox performs best with warm day temperatures and cool night temperatures. Optimal day temperatures range from 75-80ºF. Optimal night temperatures range from 50-60ºF.


Light Needs

Performs best in full sun (six hours of sun daily), but will tolerate partial shade (minimum four hours of sun daily). Best in partial or full shade in hot climate zones.


Soil Needs

Volcano phlox will tolerate a range of soils but will perform best in a well-worked fertile soil.


Water Needs

Will tolerate moderately dry conditions. Performs best when well-watered. Watering at the base with a soaker hose is encouraged. Overhead watering, or watering at night can promote conditions conducive to mildew.



In Spring, use a slow release balanced plant food suitable for flowering plants. Because Volcano phlox are such prolific bloomers, a 2nd feeding of plant food is recommended after their first bloom cycle.


Disease Tolerance

Very tolerant but not entirely impervious to mildew.  Best spaced at least 2 feet apart to allow air flow.


Pest Issues

Phlox can be affected by spider mites and thrips.


Special Care

Volcano phlox are very mildew tolerant, but it’s good gardening practice in general to take steps to avoid conditions that can promote mildew. Follow spacing recommendations when planting. Crowded plantings can reduce air circulation and promote mildew. Water phlox at the base of the plant and not from above. Soaker hoses are great. Never water your garden at night, as this promotes mildew and other diseases in all plants in your garden. Morning is the best time to water the garden. In zones 4 – 9 divide Volcano Phlox every 3 to 5 years or when the plant looses vigor or the center of the clump starts to die. Divide in early spring for best results.



Selection of Phlox paniculata



Varietal/Cultivar Name