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How To Care For A Lavender Plant. Add a drainage layer made with small gravel or clay pebbles. This plant doesnt require much watering so be sure to always avoid pooling water otherwise the roots will rot and the plant will die.
Lavender likes soil that is quite low in nutrients so plants dont generally need feeding. To avoid the worst add mulch. Avoid soil moisture at all costs.
Water once the top inch of soil dries out fertilize twice per year and provide low humidity and moderate temperatures.
This is why dry and sandy substrates that dont retain water are recommended. Use a loose soilless mix for planting and remember that container-grown lavender will require more water than garden-grown plants. Planting French lavender in pots. To grow a French lavender hedge plant one stem every 12 to 16 inches 30 to 40 cm.