Lavender is a fairly low-maintenance plant and will only need to be fertilized once a year, if that. Use a light top dressing of mixed compost and bone meal, sometime in early spring. An ideal time to fertilize your newly planted lavender is after the first watering. Allow the soil to dry, then apply the fertilizer. As mentioned before, dampness is the enemy of lavender and if the roots of the plant become excessively damp, it will kill the plant quicker than any drought or freezing temperatures. In fact, over-watering new lavender plants in spring is the main cause of growth failure. Once the lavender is planted, deeply water it every 7 to 10 days.  To achieve the proper level of watering, make sure that the soil dries between each watering; however the plant itself should not be allowed to become dehydrated.  If you are growing lavender in a Northern climate, you will water the plant very sparingly until the summer when temperatures can skyrocket and dry out the soil. You will then want to begin watering the plant every 7 to 10 days. If you're growing lavender in a pot, make sure the pot has excellent drainage to prevent water from pooling at the bottom. You can prevent weeds from growing around the base of your lavender plant by covering the soil with a thin layer of mulch. Use a light-colored mulch, such as coarse sand, gravel, or oyster shells. Mulch will also help to protect the plant's roots from winter frosts. Do not use wood mulch, which will retain moisture and can lead to root rot. The two most common pests that affect the lavender plant are whiteflies and spittle bugs.  Both can be removed by hand or with a steady stream of water.  Check the lavender periodically for reinfestation. Aphids can spread a virus known as the Alfalfa mosaic virus which affects growth and blooming of the plant. Remove any affected foliage and burn it. Be sure to sterilize all gardening tools with disinfectant, chlorine bleach, or isopropyl alcohol to stop the spread of the virus, too. , if desired. To dry lavender, bundle about a hundred of the flowers together and tie the bundle with a rubber band. Hang the bundle indoors in a warm, dark and dry location, suspended upside down from a nail, for about 10 to 14 days.If you wish to remove the dried lavender from the woody stems, you can roll the bundle on a metal screen placed over a bucket. This is called "garbling" the lavender.
سمّد التربة مرة واحدة في السنة. اسقِ النبات باعتدال. امنع نمو الأعشاب الضارة. احم النبات من الآفات والأمراض.  جفف الخزامي