After attending the Sequim Washington Lavender Festival a few years ago, I came home very excited about having my own lavender field.  On that trip, I was advised by a farm owner that 30 plants was "all you need" for personal crafting.  In 2004 I began with 3 dozen plug plants, 28 survived the first winter.  I did well selling lavender sachets at craft fairs and on e-bay.  I had been making soap from a friends' lavender for several years prior to having my own lavender available.  There was so much enthusiasm that I have added about 30 plants each year since then and plan to add some more this fall.
Currently my plants are evenly divided between Lavendula Intermedia and Lavendula Angustifolia.  Generally I mix these two varieties in my products. 
 
My lavender is organically grown, but not certified organic because of the vast amount of paperwork required.  This year I did become a "Certified Producer" as designated by Fresno County.  This allows me to sell at Farmer's Markets through the State. 

Lavender loves bad (alkaline) soil and after the first two years is pretty drought tolerant.  The single biggest killer of lavender is root rot from too much watering.  Lavender has a high camphor content which deters moths, other pests and even deer don't care for munching on lavender plants.  The camphor content is helpful to clear sinus's when used in a sachet inside your pillowcase, or in a face mask.  Others use lavender in a scrunchie in their hair to provide a calm environment at work.

Lavender is hugely popular in aromatherapy because of its qualities of relieving stress and anxiety.  It is used for its calming effects and many people find insomnia relief, easing of migraines and menstrual cramps when they keep lavender in their bedroom. 
Lavender has been used for thousands of years for the above qualities, along with healing burns and body sores, washing clothing, deterring bed bugs and as a perfume (Cleopatra seduced Julius Caesar and Mark Anthony with perfumes that contained lavender).

Some of my products include:
Lavender soap is made by the melt and pour method (I don't use caustic lye).  It is made with a goat milk / glycerin soap base, purple colorant, lavender essential oil for fragrance and dried & crushed lavender flowers from my field.  The crushed lavender flowers exfoliate dead skin and the glycerin soap base softens your skin.  I have customers in Canada, Germany and across the U.S.  Obviously they love the smell and feel of the soap.  The fragrance does wash off in the rinsing process which leads men to also love the quality of my soap.  

Lavender Sachets  
Sachets are available in many sizes and price ranges.  I am constantly on the lookout for nice linen bags and small pillows to hold my lavender.  My most popular selling sachet is in a 3x4" lavender organza bag filled with 1/3 cup dried lavender flowers for only $3.00.  They can be stuck in lingerie drawers, set on dressers, hung in cars and in closets, as well as used as a shoe deodorizer.  To renew the fragrance of your sachet, gentle squeeze.  Sachets hold their fragrance for several years; I recommend replacing every 2-3 years.  Lavender urns, found in the tomb of King Tut, are said to have remained fragrant for 3,000 years.

Lavender Eye / Face Mask 
This product is mixed with 50% flaxseed to give the mask some body, and because 3 cups of pure lavender would be too fragrant !!! 

Lavender Dryer Bags
Lavender is sealed in a large tea bag which is thrown in the dryer to give clothes a great scent.  The bag is good for 12-15 loads of laundry.  When the scent is dying, cut the bag open, sprinkle on your carpet prior to vacuuming.  Bag is made for dryer use only and becomes a mushy mess if it accidentally gets into the washer.