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Agapanthus Blue Thunder
(African Lily)



Out of stock

June - August
120cm x 100cm
Attracts Wildlife
Half Hardy

Looking for an electrifying display? Agapanthus Blue Thunder is sure to shock onlookers throughout the Summer, whether it’s potted for a striking splash of colour, or left to bloom up a storm in the border.

Additional information

Plant Type
Flowering Period
Flower Colour
Fully Grown Size
Garden Position
RHS Plants For Pollinators
RHS Garden Merit Award


Agapanthus Blue Thunder is a herbaceous, evergreen Agapanthus that is more compact than other varieties, growing to around half a meter in height. It produces a mound of light green foliage, with long thin evergreen leaves, and long stems rising up to large blooming flower heads bearing globes of deep blue flowers. The flowers themselves possess dark blue stripes down the middle of the inner petals that give this variety an intriguing look up close. Varieties like this one, due to their size, are perfect for potting up and placing on a patio or porch, and they will grow well as such provided they have plenty of sunlight! Agapanthus in general are great plants for low maintenance gardens as they don't require much water, meaning they can put up impressive displays of lots of flower spikes without much effort! Overall, Agapanthus Blue Thunder is a fantastic plant for any garden, be it that you need something to plant up in your bed or border, or maybe you're looking for something to fill a pot - This variety has you covered.

Planting Conditions

Agapanthus should be planted in moist but well drained soil, particularly those composed of sand, clay, loam or chalk. They aren't fussy about the pH of the soil, however they will need to be planted in a spot that's sheltered and has plenty of access to sunlight. They will grow particularly well potted, as if their roots are constricted they will flower more, though they can work well in a bed or border provided your soil doesn't tend to get waterlogged.

Watering & Feeding

Agapanthus require little water compared to other plants, and particularly dislike being waterlogged so this is worth bearing in mind if your soil has a tendency to stay wet for long periods after watering. They should be watered once or twice a week - a good way to tell if they need a water is by checking the top inch or so of soil. If it's dry then it may be worth giving them some more. As for fertilising, this should be done in Spring and Summer, with a 1-2-1 ratio.

General Care

Agapanthus are very low maintenance overall, needing little watering or protection from disease or pests. They will need protection during the Winter if you want them to come back next year, a greenhouse is the best choice to ensure they maintain a temperature where they will survive. When you receive your plant, dig a hole twice the size of the pot and fill in the area around the plant with compost. A 3 inch layer of mulch should also be applied around the base of the plant, then water it to keep it moist until it's established.