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It's a good idea to pick out a plant sold by a local nursery, since it will provide varieties that do well in your climate. There are many different species of lavender that each have slightly different needs, so if you order a plant online you might not end up with one that will do well in your region. If your local nursery doesn't sell lavender, do a little online research to find out which varieties work well in your area. The most important factor will be the climate. If it gets cold or very wet where you live, you'll want a hardier species like Mustead or Hidcote. If you live in a place with very mild winters and hot, dry summers, you'll have more options available to you. Lavender is native to Mediterranean countries. To help it thrive in your yard, you'll need to recreate a similar hot, dry, seaside environment. Choose the sunniest spot in your yard for lavender, as it needs at least eight hours of sun every day to grow healthy. Look for a spot that's sheltered, but not shaded. Lavender can blow over in high winds, so it's a good idea to plant it near a wall or other large plants that don't loom too high, but are large enough to block the wind. Lavender won't grow well in damp, soggy soil. It needs dry, sandy soil that drains very quickly so the roots won't rot. Check the soil's drainage by digging a hole and filling it with water. If the water drains quickly, the soil should be fine. If it stands in the hole and drains slowly, you'll need to amend the soil or find another spot.  You can improve soil drainage by tilling the soil to a depth of about six inches and mixing in some builder's sand. This helps mimic the beachy natural conditions in which lavender plants thrive. You could also choose to grow lavender in a pot or a raised bed, which allows you to control the soil's properties more carefully and tailor them to the lavender's needs. Purchase a pH soil tester from a garden center or nursery to check wither the soil is alkaline enough for lavender. The ideal pH level for lavender is between 6.5 and 7.5. You may need to add lime to the soil to increase its alkalinity.  A little lime goes a long way. Add just 2 or 3 ounces per cubic foot of soil. If you're using potting soil, check the label and buy soil with the correct pH.
Pick out a lavender plant. Choose a sunny spot in your yard. Check the soil for drainage. Test the pH level of the soil.