I have an information sheet that I received from the OFM some time ago that states:
It is not intended that Christmas trees be included as ” other decorative materials”. The Fire Code has no provisions for regulating the combustibility of Christmas trees. However, Christmas trees, both real and artificial, can present a fire hazard and we recommend that the following guidelines be followed:
1. instead of a live tree use an artificial tree which has been tested to show that it is noncombustible;
2. tree decorations should be noncombustible;
3. ensure that tree lights are CSA approved, and check for and deterioration, loose wires, faulty connections, etc;
4. do not use candles and open flames on or near Christmas trees;
5. do not locate the tree in a means of egress or obstruct exit doors.
If you do use a real tree then, in addition to the above, the following guidelines should also be followed:
1. use a freshly cut tree and do not keep it indoors for any longer than necessary;
2. make a fresh cut on an angle at least one inch above the original cut end;
3. keep the tree standing in water during the period the tree is indoors;
4. add water to the container daily to keep the water level above the angled cut of the trunk;
5. check the tree daily for drying out. A simple test of removing a small sample and taking it outside for a match test will indicate the condition of the tree. A dry tree is a hazard and must be removed immediately;
6. do not locate the tree near heat producing devices, e.g. stoves, heat ducts, direct sunlight through windows, etc.
Hope this helps!