Lavenders are enduring perennials that can live for years on end if you give them the right conditions. Due to the fact that they originated in the Mediterranean, it’s no surprise that lavenders are a big fan of the sun.
They also love dry soil, much as you’d find in the deserts of Ancient Persia. If your lavenders are struggling, you’re likely giving them too much water, not enough sunlight, or you might just be in an area that isn’t arid enough for these desert plants.
If you live in a colder region, your best bet is to get English lavenders. Be sure to get winter protection though as heavy snowfall is the last thing that lavenders want to deal with.
French and Spanish lavenders are more resilient to moisture but will need enough space between each plant to ensure that they get enough air circulation — they will need pretty hot temperatures to flourish though.