copy from http://everything-lavender.com/lavender-care.html
How to Plant Lavender
Whether you reside in a hot dry climate or chilly coastal region all Lavender plants basically require the same things in regard to Lavender plant care which are proper soil and sunny location. Plant Lavender plants in full sun which means at the very least 6 hours or more as that is what this plant needs to thrive.
The soil needs to be a light sandy mix which allows for good drainage. These plants hate "wet feet" and they prefer dry alkaline soils (ph 7.1) over acid ones. Look at this picture and pay particular close attention to the soil.
Image by Brice GDFL
You can add lime 石灰 to your soil to adjust the ph to and make it more alkaline. Heavy soils or those with a lot of clay will require you to dig them out and mix them with sand to loosen the particles. Roots grow between the soil particles and if the soil is clumpy or cakey the plant will not do well.
This is one plant that you don't need to fertilize. If you add fertilizer it will spur it to growing a lot of leaves and make it less fragrant. Poor, lean soil produces a plant that has a higher concentration of essential oils which equates to higher fragrance.
You want it to bloom as the fragrant flowers are highly desired. The purpose of blooming is to make seeds and reproduce. A plant that is over fed doesn't want to set seed. If your soil is really, really bad add a little compost to your soil, maybe a handful or two, and mix it in well.
You also don't have to worry about spraying for pests which makes this plant easy to care for. The plant's essential oils and fragrance attract the beneficial insects andrepel the not so nice ones.
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