Lavenders

I'll ask a question...

I'm in the SF Bay Area, and am probably a Sunset Zone 16, or maybe 17, which I think is a regular zone 8. Anyway, I have about 6 lavenders in my yard (need to get more!), and my two oldest plants, which are actually lavendins - Provence - are starting to get quite woody underneath. They are still growing well, and are large with great flowering, but they are almost 5 years old. Do they need to be replaced periodically? I prune after the flowerheads are all dried up, going down a few inches into the greenery past the stalks. Is this too little? I've also tried taking cuttings using the Oasis blocks, but nothing has taken. Any advice?

Kris
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