You are in zone 9, I would reconsider a different plant. Most sites that profile or sell either of these hollies can be easily found online for both 'Blue Prince' and 'Blue Princess', they are very common and it is VERY easy to find information on them. A google search is all you need. http://www.evergreenplantnursery.com/Blue-Princess-Holly-p/holbpc1.htm Ilex x meserveae 'Blue Princess' A Meserve hybrid holly that is the female clone match for Blue Prince Holly. A much improved version of Blue Girl Holly, and known as one of the best berry producers of all Hollies. Berries are a dark red color, and are set against foliage that is a lustrous bluish green color. Has a good, dense growth habit and is very broad in growth as well - not quite as pyramidal as Blue Prince. Considered as one of the hardiest of all the Meserve hybrid hollies, right along with Blue Prince. Likes full sun, but will accept fair amounts of shade as well. Somewhat moist, well drained soil is preferred for best results. Must use Blue Prince to pollinate in order to achieve berry production. Height: 12-15 ft Spread: 8-10 ft Growth Rate: Moderate ( 4"-6" avg per year ) Hardiness Zones: 5-8 Sun Exposure: Full sun to shade Soil Preference: Average to moist & fertile - well drained Now notice is says zones 5-8. You being in zone 9 indicates it is somewhat out of the range. You can try it, but I would imagine there would be better choices for your zone. I would look into other alternatives for your site. Camellias, Daphne, Ceanothus. Where do you live? I would make the choice much easier if you indicated where in the country you actually live!

I can't really give you any advice on the Inkberry. I don't have it myself, have seen it do great in some places. You might want to dig around the base to see if there was a planting issue (was it planted too low, is it too close to the house and the overhang is not allowing it to get the rain?). The Blue Boy should be fine for the Blue Princess as they are both types of Ilex x meserveae. If you don't see evidence of pollination after the first full year in place, you can add a Blue Prince somewhere to the property then, but I don't think you'll need it.

Probably not much difference but you will need to have planted at least one male holly, for example, Ilex m. 'Blue Prince', to have all the 'Blue Princesses' flower and develop any red holly berries. It only requires one male in the vicinity of multiple females to get a fruiting display. I have my 2 hollies, one Blue Prince and one Blue Princess, planted about 3 to 4 feet apart. They have grown together, and the female puts on a great display of red berries every year, but it depends on the look that you want to achieve.

Interesting. So I have been watching the fruity one for 3 years now, and it seems to have that yellowish tinge every year. I just thought it was its natural color. It does seem to have a lighter colored leaf even in summer. Below are some pix I've taken at different times of year. (Yes, I'm obsessed with the stupid tree :-). We did have a dry late summer, maybe that contributed. But on the other hand - look at the foliage color difference between the two hollies even in summer: 2016-11-12: 2017-01-12: 2017-08-16: 2019-05-22