One female flower in 4-6 feet of stem sounds about average, Ladyessex. When grown commercially, they are grown up and down a series of strings. Make sure that it is planted in a big container, at least 18" wide and deep, and gets regular feeding. Side branches mean more flowers, but may slow maturity. I would double check the temperature, too. Less than 27º C, and fewer female flowers will form.

Thanks for the info Tugbrethil, the Que is in the ground in the greenhouse, I tie it to the support poles as it grows, I feed it with Tom Feed. :o))