ssgardener ...
I don't think humidity is the issue. I live in what is termed a wet Mediterranean climate. When we are not in extreme drought, I get heavy rain and some snow from December through April. Of course, during the true winter months, the thyme is affected by the cold and tends to die back, but as we move through spring towards summer, it comes back strong and beautiful.
I think the real key is drainage. That's through observation. As others on this forum will tell you, I freely admit to being a novice gardener in all things gardening, except for roses.
I think, if you have good drainage, you might want to try it again ...
Smiles,
Lyn
