By Bobbler
United Kingdom 
Hi they are trailing fuchsia and giant refers to the flower head size. There are 6 gates
3 May, 2015
Answers
The answer is as given before then - 10-12 depending on the vigour of the plants. Or you could put one in each gate and three in the top leaving room for a funnel or something in the centre to help water get to the bottom of the compost.
3 May, 2015
You need to add this to your original question as a comment Bobbler so that the folk who replied see
3 May, 2015