Posted: 22/08/2016 at 08:51
Mock Orange,,before you do anything can you post a picture?
although your plant came in a 28 cm pot have you checked the root system? Does it look congested? If you can tease those roots out do they occupy a greater area? (I know they will do but when spread out a 55 cm pot may not be too big) If the root system is small you can follow the above advice.
Olives usually have vigorous thick roots and benefit from a larger pot. The local town here has them in huge containers. I really do not think "overpotting" in this case will be a problem.
I would not do anything to lighten the pot either with polystyrene. Weight will be important (use john innes) to avoid the wind blowing it over.
If your olive looks a bit lost initially plant a (relatively) shallow rooting sun rose (helianthemum) too. helianthemum will add evergreen foliage and spring and summer flowers. The Wisley sun roses, Pink and Primrose, are beauties with nice grey foliage
Last edited: 22 August 2016 08:52:15