I remember years ago AT chatting to an old lady about her tulips and what was her secret to getting them to come back year after year. She planted them all at least 9" deep. I suspect that being deep is not the problem.
Vendée - 20kms from Atlantic coast. "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
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Maybe those weren’t deep enough.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
When you don't even know who's in the team
S.Yorkshire/Derbyshire border