Lobelia Monsoon Lobelia Monsoon blooms from June until September, it produces bundles of pretty sapphire flowers that are complimented by its deep green foliage. Easy to care for, these Half-hardy annuals require a partially shaded spot to grow and virtually no maintenance as they develop. This Lobelia looks superb when grown in a container sitting on a pretty patio, it is also made for adding to mixed baskets so it can overflow with fabulous colour and texture. Lobelia Monsoon enjoys cascading and sprawling to create a showy display, so be sure to add it to alpines and rockeries for eye-catching ground cover.