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One key to getting lavender to grow in a warm humid climate is to never water them, unless they are wilting. Water them to get them started. After they get going wait until they are wilting and then water them only at the outer edge of the foliage, never get them wet where the stem meets the ground.
If you are planting them from container grown stock plant them high, have the root ball sticking up above the soil level by 2 inches, that will keep the stem dry. The roots that feed the plant are in the bottom of the container.
Do not mulch or allow leaves to cover the stems.
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Foxglove is another plant that tends to rot where the stems meets the ground it they get too much water. They are a shade plant for your climate. Planting them under a deciduous tree would probably be the best site for growing them.
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I grow both lavender and foxgloves here, but, they are winter annuals. The only lavender that I have had survive our summers is Spanish Lavender - L. stoechas and it only survives if planted an area with lots of sun, good air circulation and no summer water.
Here is a lavender, in a pot, set in a mixed flower bed>