Believe me when I say that not all Christmas trees are created equal. I know because I was assigned to set fires under the five most popular Christmas species.
In 1995, I was asked by the Maryland Christmas Tree Association and the State Fire Marshall’s office to research the most fire-resistant species. I tested white pine, Scots pine, blue spruce and both Douglas and Frazier firs. The State Fire Marshall set the rules. I rolled a single sheet of newspaper into a ball about 10 inches in diameter. I placed the ball against the lowest branches of the tree, then set it afire.
Ancient Ailing Oaks
Q I live in the St. Margaret’s area near the Bay Bridge. In my neighborhood, many, if not most, of the old oak trees are dead or dying. These are original trees in an area that was never farmed; I’m sure many of them are well over 100 years old. It is so distressing since they are beautiful and I love them and because it costs $2,000 to $3,000 to have them cut down. Do you know why they are dying? Is there anything I can do to save them? I think they are red oaks, though my tree identification skills are poor.
Thanks so much for your help. I read your column every week and thoroughly enjoy it.
–Linda Williams, Annapolis
A There is no way that I can determine the cause of death without seeing the conditions in which they are growing. I have cherry bark oak trees in my yard that are over 150 years old. I keep them healthy by vertical mulching every four to five years. When I moved here 22 years ago, they were in a severe state of decline, but after being vertically mulched, they revived. I suggest that you contact Mark Emmel at 301-345-2981. Mark is a good arborist and is familiar with vertical mulching.
Ask Dr. Gouin your questions at DR.FRGouin@gmail.com. All questions will appear in Bay Weekly. Please include your name and address.
Fresh-cut trees of each species were delivered to me at Upakrik Farm and stored — some with, others without water — at 70 degrees with lights on for eight hours. Trees were held in storage for three and six weeks prior to testing.
We set the fires in the Fire/EMS Training Academy’s burn building at Cheltenham, with several Christmas tree growers watching. Each variant of the experiment was replicated three times and videotaped for evaluation by fire marshals from three counties and from the state office.
White pines generated lots of smoke regardless of the amount of time in storage. They were immediately rejected by the fire marshals.
Frazier firs were also rejected. Stored without water, they burned readily after three weeks of storage. After six weeks, they exploded into fire.
Douglas fir was approved as the most fire-safe tree because even after six weeks of storage without water, it did not ignite. Scots pine and blue spruce were also approved.
We repeated the experiment in 1996 with exactly the same results.
As a Christmas tree grower, I attribute the Douglas fir’s fire-safe performance to its low resin content. My knives and pruners remain clean even after days of shearing. This is not true with the other species tested.
As a result of this study, the State Fire Marshal established COMAR 12.03.04, allowing only Douglas fir, Scots pine and blue spruce in public buildings. Each tree must be accompanied with a tag identifying the farm where it was grown, date of harvest and species. Before the tree is moved indoors, two inches must be cut from the base. Tree stands must hold a minimum of two gallons of water. The tree must stay indoors no longer than four weeks.
To keep your house fire-safe this Christmas season, follow these recommendations.