Growing Lavender in Mexico

I'm looking for lavender growing information for San Miguel de Allende area of Mexico. SMA is just north of Mexico City at 7,000 ft elevation. Even though it's in the tropics it's a high desert climate with a rainy season in the summer and mostly dry the rest of the year. It seldom gets below freezing but we have had some freezing this winter and in May and June can get quite hot - 30s . I'm not sure what the Zone number is but it seems to be similar to southern california. I'd like to grow angustifolia and Lavandin for flower and oil on a small commercial basis. Any suggestion of varieties to try in our test plots?

It is hard to say what varieties will do best in your area because we don't have much information about lavender growing in Mexico. I suspect that you would have good success with varieties such as 'Provence' or 'Grosso' (among the lavandins) and 'Lady', 'Munstead' and 'Hidcote' (among the angustifolias).
Lavender can tolerate quite a lot of heat, but it suffers in excessive moisture. If you can control the excess moisture and humidity during the rainy season (good drainage and possible shelter from the more punishing rainfalls) then you may have good results.
Lavenders are known to grow well in zones 8-10 which, judging from the southern U.S. zones of the USDA zone map, are similar to northern Mexico (at least).