Problems growing tree in a tall narrow pot
This past season I've had very little growth from pawpaw seeds planted in tree pots measuring about 4inches x 4 inches and 14 inches tall. The idea for using these size pots is to better accommodate the pawpaw's long tap root. The medium that I used was about 50% pine fines, 20% peat moss, 20% diatomaceous earth and about 10% leaf humus with some controlled release fertilizer. I also did some with a higher % of leaf humus and these did markedly better though not well. There are many variables here but my feeling is that the problem here was a combination of the pot dimensions with the choice of medium. Looking for advice from someone who has had experience growing trees from seeds in tall narrow pots regarding choice of medium and what they think went wrong with my trial. Thanks.