Hi I am new to this site earlier this year I bought a Canna Lily for my Patio and it was rather like twizzle it grew and grew

Glowing, your original question has already been answered, scroll down to read.

Glowing you can reply to answers to your questions by writing your reply as if it were another comment (Where it says "add comment".

Glowing, the underground parts of Cannas are technically rhizomes, instead of true bulbs, which explains why they bear no resemblance to the stereotypical Daffodil or Tulip bulbs. Most gardeners, however, refer to any underground plant part that can be dug up, shipped around the world, and sold in bins in the garden center as "bulbs". :)

Agree with Tugb. 'bulbs' is a generic term, most gardeners don't know what the actual differences are - or so it would seem to me reading GoY.

To clarify how to respond when you get answers, scroll down to where it says How do I say thanks? - beneath that is a narrow empty box, click in that, it expands and you can type whatever you want to say in there.

But in your first post you said 'it' had mould on it, so when you said 'it' what exactly did that mean, because I assumed you meant the tuber/bulb?