Two seasons ago, I planted some Jacob Kline Monarda in the garden, and
had wonderful results. Last season, dozens of seedlings grew in the
same area, but not a single one grew to maturity. This year I have
lots of seedlings again and would like to ensure they grow to blooming
stage. What might I do to enhance their chance of success? Should I
thin out the seedlings so they don't compete with each other?
Fertilize frequently? Any advice appreciated.

-Fleemo