Hi All!
I have an Olive Tree which I purchased from Aldi about three years ago along with a Brown Turkish Fig. I planted both in large patio planters (2ft square, 18ins high) in March of the year of purchase in general compost, after first soaking the root ball in water, with some crocks in the bottom for drainage. I dressed the top with small pebbles to cut down the weed growth and retain water.
The olive is now 3-4 ft tall and survives the winter here in Wales well. The fig is 4-5 ft tall and last year I picked 14 figs! I am going to plant it in the garden this year as it is rapidly outgrowing the planter. At the moment there are a large number of green buds waiting to burst at the onset of some warmer weather. The olive retains most of its leaves overwinter, but the fig turns some bright shades of reds and yellows and the leaves drop after the first frosts. I have not treated them in any special way and they are both healthy!
Hope that this is of some help,
All the best,
Martin.