Lobelia siphilitica f. albiflora 'Alba' (Marginal Aquatic)White Cardinal Flower

Hardy Perennial

What is Hardy Perennial?
A plant that lives for more than two years.
Capable of withstanding outdoor winter temperatures down to -15C.

Fulfilled and sold by Thompson & Morgan

Want to get notified when back in stock?

Please note: This product cannot be delivered outside the United Kingdom.

Height Up to 120cm (47.2in)
Spread Up to 30cm (11.8in)

Hardy Perennial

cottage gardenswater gardenwildlife gardensexotic garden

Sun or semi shade

Flowering Months

You May Also Like

Tall spikes of bright white flowers rise above the light green foliage of this hardy perennial throughout summer. Moisture loving Lobelia siphilitica f. albiflora 'Alba' is a handsome, statuesque plant that grows happily in sun or semi shade. This tall perennial makes a lovely addition to moist borders and bog gardens, or planted in the shallowest margins of ponds. Height: 120cm (47"). Spread: 30cm (12"). Planting depth: Zones 1 & 2 to 5cm (2") below water level.

Plant height and spread is seasonal therefore we list by pot size rather than a defined plant size. The height and spread of the plant delivered will vary depending on the season, meaning arrival images are an indication only.

3 x 9cm potted lobelia plants (78325)
1 x 9cm potted lobelia plant (78324)
3 x 1 litre potted lobelia plants (78323)
1 x 1 litre potted lobelia plant (78322)

How to Grow
Grow Lobelia siphilitica in a sheltered position in sun or semi-shade on reliably moist, fertile soil. Lobelia copes well with boggy soils and can be planted at the edge of ponds and streams with the crown to a maximum depth of up to 5cm (2") below water level.
More Info
Cut back old lobelia foliage in autumn. Lobelia cardinalis is a short lived perennial - divide it every 2 years in spring to maintain its vigour. Caution: irritant to skin and eyes.

Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £2.99.

Orders which include any other products will incur a delivery charge of £4.99.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £6.99 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details, and more information on different charges that may apply to certain destinations.

For more information on how we send your plants please visit our Helpful Guide on plant sizes.

Thompson & Morgan strives to ensure that all its plants are delivered to you in the perfect condition for planting. Sadly, the time it takes to deliver to certain locations in the UK means that we can't guarantee this, so regretfully we are unable to ship live plants to the following areas: HS, IV41-IV49, IV51, IV55-56, KW15-KW17, PA34, PA41-48, PA60-PA78, PA80, PH40-PH44, TR21-TR24, ZE1-ZE3

Sign Up For Exclusive Special Offers


Sign up for exclusive offers!