We arrived from a 22.000 sq feet garden in South Africa JHB and now rent a house in Willingdon heights Burnaby with 3 terraces facing full SOUTH.and quite some nice shrubs, Cypress, Holly, Xmas pine etc. protecting the top area BUT the 2 terraces are barren earth with gravel on top. It needs green and fast and big :-). We brought several big heavy 2x3 feet concrete planters I got 2 Gunera plants in a Nursery in Richmond and want to put them in the planters as we only RENTING NOW and I will be moving in a year or two and want to KEEP the plants. QUESTION; Do Gunera grow in concrete pots ? Do they stay small if the root system can't grow unlimited ? Will they somehow mature, I don't expect total growth in a pot, but somehow bigger than what they are now. In the moment the total plant with 3-4 leaves is 2feet high and 4 feet across in small free brown plastic pots from the nursery. Will they survive a winter in Burnaby ? Will these concrete planters be too cold for the root system ? What if I sink the them 1/2 into the ground ? Would your recommend wooden round planters available here in nurseries? Or shall I simply plant them and when we move unearth them and take them with me. BUT how deep are the roots? Are Gunera roots like trees, equal under earth what is above ground or shorter like palms etc. I had loads of normal Rhubarb in South Africa and the roots were not very deep, say max 1 foot depth for 3-4 feet high leaves. Would anyone know if they would survive an unearthing and transplant ? Can they be divided like normal Rhubarb, say one or two three years from now and take them to a new house and leave some for the landlord who is nice. Don't want to leave him with an impression I take away all the plants that I grew IF not in pots. As we are ONLY renting at this time I would rather stick to the planters but am concerned the Gunera may not like it. Have seen HUGE ones on 49th street south facing but in the earth that is what prompted me to buy them at the nursery. Thanks for any 1st time advice for my new garden in Canada.