Kalmia latifolia Bumblebee - Mountain Laurel

Native to the mountains of eastern North America, Kalmia latifolia is extremely hardy and can withstand very low temperatures, below -20°C (-4 °F). Belonging to the Ericaceae family, it needs to be planted in a semi-shaded position, in a humus-rich and fertile soil, acidic, moist but well-drained.  Plant in spring or autumn, avoiding periods of frost or high heat. Prepare a wide and deep pit, 40 cm (15.7 in) by 40 cm (15.7 in) so that your Kalmia can quickly establish itself.  Regular watering in the first few weeks after planting is necessary to keep the soil moist. A mulch at the base of the plant can be beneficial to protect the thin and superficial roots.  Each spring, scratch the soil around the base of the plant and top with compost, ericaceous soil and mulch. If the soil is calcareous, it will need to be completely replaced by a mix of ericaceous soil and leaf compost in a large planting pit.  The mountain laurel dislikes scorching situations and sweltering summers. It must be placed in such a way that it is shaded during the hottest hours of the day. The mountain laurel dislikes exposure to strong sunlight, especially in case of drought, and ensure regular watering (preferably with rainwater). This summer watering is particularly important since this is when the flower buds form for the following spring. The mountain laurel, liking coolness and good humidity, will thrive in coastal or rainy climates. With its slow growth, it is well suited to pots on a patio or balcony but use a large pot and water well to avoid the soil from drying out. Apart from removing faded flowers, pruning of Kalmia latifolia is hardly necessary. Indeed, it risks damaging the flowers for the following year, as the flower buds form at the ends of the branches. However, it is possible to remove dead wood and carry out a very slight refreshment to maintain a balanced habit.