muffen

I was given five banana plants back in march. They were all growing in one big banana grove. I have no clue what kind of banana they are. I am 90% sure all of the banana's at this person's house were the same type. He had some in pots in doors which had leaves touching the ceiling and a corm outdorrs that was at least 5 feet tall. All of the banana corms were dormant when I moved them to my house but started growing leaves within about two weeks. I live in Tucson so the summers get VERY hot. There fore I planted them on the east side of the house so they wouldn't receive the most intense rays in the afternoon. They are also mostly out of the wind in this spot. I water them with a slow drip/flow for 20min-1hr daily. The leaves look happy with only occasional scrotching on the newest leaves. I also fertilize with at 3Tbl spoons of palm tree food once a week. My question is...I have had these bananas since march and they are still under three feet tall. Is there anything else I can do for them or should I just be patient?