grannysgarden said:Tisha... you are not a gardener unless you have killed some plants.
This bears repeating. ALL of us, I daresay, have killed plants. Too much sun, too much shade. Too much water, too little water. Too much fertilizer in too hot a planter. Too much of the wrong fertilizer, and too little of the right one. And so on.
(One of my potted blue-eyed grass plants looks a deader; I think I may have watered it too much. 
)
Gardening is a life-long learning process. We can learn all we can about certain plants, even become something of an "expert", but still get stumped by those same plants. And those plants are a microcosm of all the plants that God has blessed us with. We can spend a whole human lifetime and not learn all there is about growing them, and most likely we will be making mistakes every step of the way.
And speaking of experts... The late great garden writer Henry Mitchell once wrote about his frustration in being unable to grow some simple little plant that everyone else he knew could easily grow. He could not figure out where he was going wrong, and iirc (I might be wrong, it's been many years) came to a general conclusion that any gardener might expect to encounter this sort of problem.
(People a mile or so away from me seem to have no difficulty growing horehound, get mine eventually dies. 
)
Therefore the only advice I can give is to keep on gardening! Let go of the bad advice (and forgive those who gave it), learn from your past mistakes but don't dwell overmuch on them, and get back in the garden and boldly forge on.
The day we stop gardening, is the day we start to die (if we aren't already dead).
