Thunder Storm™ agapanthus

Compact, easy care and drought tolerant, Thunder Storm is one of the Storm™ series of agapanthus that produce more flower stems than any other agapanthus.   In fact, Thunder Storm flowers on average up to 10 weeks per season (up to two to three weeks longer than most other varieties).


Thunder Storm_7244 LRThe variegated leaves are distinct with the leaves having a strong creamy yellow edge to each of the leaves with stems topped with spheres of striking blue flowers.  Thunder storm is more floriferous than other variegated foliaged agapanthus.

Thunder Storm™ grows to a compact 20 inches (1½ feet), an ideal height for landscapes and container plantings, as most other agapanthus are either much taller or shorter.

Agapanthus is increasingly popular with gardeners and landscapers for its easy-care nature, crisp exotic look, and long-lasting flowers. With its lush tufts of dense, strappy variegated leaves, the plant adds flair to the garden even when not in bloom.


Key Features

  • Quick to bloom
  • Distinctive variegated foliage
  • Compact in size and uniform in height
  • More floriferous than other variegated leafed agapanthus
  • Low maintenance
  • Great for gardens and landscapes
  • Suitable in USDA zones 8-11
  • Drought resistant and a fire retardent plant


Suggested Uses

Commercial landscapes, perennial beds and borders, container plantings, fire-retardant borders.


Growth Habit

Free-standing basal cluster with strap-like leaves. Large, thick, fleshy roots approximately ¼ inch in diameter. Upright, medium size with normal to slow growth rate for genus. Full height is achieved in 18 months.


Growth Pattern

Cluster diameter to 20 inches.


Plant Size

Grows to 30 inches high (includes flower).


Flower Size

Flower umbel is approximately 4 inches in diameter, 30 florets per umbel. The green bud is lance-shaped up to 2 inches in length by ½ inch wide. There are six petals per floret, 1 ½ x 3/8 inch.


Mature Height

20 inches tall (not including flowers)


Mature Width

20 inches wide.



Space 2 feet apart for garden border.



USDA zones 8 to 11.


Flowering Period

Flowers abundantly in late spring to mid-summer with spot flowering through late summer and fall – approximately 70 days in all.


Number Of Flowers

The variegated forms of agapanthus are normally shy in flowering; however Thunder Storm flowers more readily than other variegated varieties.  Each plant can produce up to 10 stems of blooms


Flower Color




No fragrance.



Variegated green with creamy yellow edge and dense leaves are arranged in a tuft or cluster. Each leaf is narrow and strap-like, measuring on average 14 inches long by ¾ inches wide.



Remove dead flower stems after flowering in late fall.


Light Needs

Grows in most light conditions. Flowers best in full sun but will flower in reduced numbers in partial shade.


Soil Needs

Thunder Storm™ will tolerate a range of soils from sand to clay.


Water Needs

Water well to establish. But once established in the landscape, agapanthus are tolerant of both wet and dry conditions and have proved to be an ideal landscape plant for drier warm or tropical areas.



Promote initial growth by providing high nitrogen fertilizer for initial growth, but once established use a flowering plant formula high in potassium to encourage flowering.


Disease Tolerance

Agapanthus are not prone to disease in the landscape.


Pest Issues

No major pests. Snails and slugs may cause slight damage.


Special Care

Easy-care plant. Initially, better performance will be attained if plants are watered and fed regularly, but once established Thunder Storm will flower readily with minimal care. In colder zones, either winter protect, dig and store, or store potted plants “as is” in a frost-free location.


Special Notes

Good plant for dry, sub-tropical areas. Thick, moisture-retentive foliage makes agapanthus effective in fire-retardant borders.


Varietal/Cultivar Name