Over the last couple years we've planted all different kinds, French, English and Spanish. After watching their growth patterns I've come to the opinion that Spanish, work better for landscaping then as row crops. They tend to sprawl around and make the rows uneven, and grow too close together which seems to cause mold. They bloom at a different time than the others, so we do love the way they extend the blooming season.
While I was chained inside to the computer over the last few weeks, Drew (it's time for a name change) was eager to get outside and do some planting. He attacked the job with a fervor that is rare to see, even after 14 years of watching him attack things with a fervor. Lost count early on, but in the span of 2-3 days he had transplanted probably in the neighborhood of 50 plants. He extended and evened out the rows, bringing order, reason and sanity to the design.
Personally, in the case of lavender, I like the consistency of planting groupings of all one kind together, for the way it creates an uninterrupted blanket of color when in bloom. My favorites are still Provence and Grosso. They grows in long stalks, have a wonderful scent, and the base of the plant stays neat and tidy like a pincushion. Drew prefers mixing different kinds, creating more of a mosiac of lavenders.
This led to a heated discussion, and a satisfying compromise was reached (which was diplomatic of him, considering he was doing all the work) to plant the irregular sized and different types in a row hedge along the south side. Inside the main rows are mostly Provence and Grosso (not sure how to tell those two apart). There are a few Munstead, the edible type, which are smaller and a deeper purple, still mixed in.
Here is the new, updated, "Lavender Patch 2.0":



And in case you

He's baa---akk.... Mwah hah hah....