My basjoos arent doing so good. All of a sudden the new growth in the center is coming out black and very thin. they are also growing verrrrryyyy slow. They used to put on 3-4" a day, now its maybe 1/2" a day. One that I sold to a customer is growing like a weed. Its doubled in size in 1 month. Mine havent changed in a month. Maybe its too hot in the greenhouse? too much light? any ideas?