Hi, I bought a Kaffir Lime tree at OSH 2 yrs ago and last year another branch grew really fast and taller than the original tree last summer. The new branch has thorns and big leaves and doesn't look like kaffir lime leaves. I'm attaching a few pictures to assist you in identifying the plant. I would like to know any suggestions if I should prune it or leave it as is and it would be very nice to know what to expect from this.
I think it is growth from the rootstock. Being a tree from Four Winds, it might be Cuban Shaddock as described in this external forum thread.
Thanks for replying. I'm new at planting and I read the forum you referred. At least now I know what is a rootstock and a scion. Since this rootstock is getting so tall, is it advisable to cut it shorter? I don't have space and I'm scared it can just grow a lot more taller.
Generally speaking, rootstock growth is removed so that all the tree's energy is directed towards the scion. All of that growth should be removed unless you plan to graft more desirable varieties onto it. Perhaps someone could confirm. There appears to be a diagonal graft union on the other stem a few inches up from the soil.