How to grow Lavender ‘Grosso’ (Lavandula × intermedia ‘Grosso’)

Lavender Grosso is nothing if not versatile and can be grown as a low hedge, edging for a border, a central display in a border or island bed or as a specimen plant in a container. Its requirements are modest:

POSITION
• As sunny as you like, ideally West or East –facing
• Grosso is perfectly happy in a coastal garden

SOIL
• Well-draining – Lavender Grosso is yet another plant that will not tolerate being waterlogged
• Chalk, sand or loam
• Grosso prefers a neutral to alkaline soil but tolerates acidic conditions

PLANTING
• For each plant, dig a hole twice as deep as the plant roots’ length and two to three times as wide as their width
• Mix in sand and organic compost with the soil to create a light, friable loam
• Gently ease the plant out of its container and hold over the hole while filling in with the prepared soil. The top of the plant is level with the ground
• Water well.
• Apply an organic mulch, leaving an exclusion zone around the stem
• Lavender Grosso is generally planted three to a metre

NB: Grosso can be planted throughout the year other than when the ground is frozen

FEEDING
• Add potash to encourage flowering but avoid manure and fertilisers with a high nitrogen content as this will produce leggy, floppy specimens

PRUNING
All Lavenders are programmed to turn their vegetative stems into wood – a key purpose of pruning is to delay this process for as long as possible.
• In the first couple of years, pinch out the tips of new growth to encourage dense branching. This will help create a good shape
• Flower spikes can be safely cut at any time for display or drying (Grosso makes excellent potpourri). Otherwise, the flower spikes should be cut back as soon as flowering is over. Get in quick, and you may be rewarded with a second flowering
The foliage can be trimmed at the same time to maintain shape
• Inspect plants in early spring (once winter is over) and cut out any part of the plant that may have succumbed to frost
• Established plants should have their shoots cut back hard – by at least 1/3. Don’t be afraid to show them who’s boss – it will keep them vigorous and prolong their life.
If your plant have old wood, cut to a few nodes above it

NB: A well-pruned Lavender will be in a much better position to cope with the worse of winter weather