Determining Holly Tree Sex
How do I determine the sex of holly?
I purchased a small holly tree with silver edged leaves one Christmas, and when the season ended, planted it outside. Contrary to all predictions of the USDA zone map, this particularly un "cold tolerant" variety of holly survived. It is now five feet high. The thing is, I understand many varieties of holly come in "male and female" and you only get berries if you have a male and a female plant growing together.
1.) How do I determine if this tree is male or female, to get it a life partner of appropriate sex?
2.) Can anyone tell me exactly what variety of holly this was?
3.) How close together do the male and female trees have to be?
4.) I saw "Blue Princess" Holly trees at home Depot. Are these enough like the silver tipped holly bush I have to interbreed and produce berries?