Hardiness Zone: 7a
Pat from Lubbock, TX
Sweet Gum trees are considered to have a medium to fast growth rate. A medium growth rate indicates a tree that has a vertical growth of between 13 to 24" per year. A vertical growth rate of 25" or more a year is considered fast. These rates represent ideal conditions, of course, and don't take into account numerous variables such as soil fertility, drainage, moisture availability, light exposure, etc. With a mature height of 60' to 75' and a canopy spread of 40' to 50', they provide wonderful shade and diverse fall colors.
Sweet Gum trees prefer full sun and moist soil conditions, although they are considered somewhat drought tolerant. They seem to tolerate a wide variety of soil conditions.
One thing you may want to consider with these trees is the fact that after the first 12 to 20 years, they start to flower and produce prickly round "gumballs". Many homeowners find the gumballs a messy (and dangerous) tripping hazard and a real nuisance to clean up. Others use the gumballs for craft projects or as mulch (animals, especially rabbits, don't like stepping on them). If you are planning on planting a Sweet Gum in a high traffic area, you may want to consider the sterile, fruit-less cultivar called Liquidambar styraciflua ('Rotundiloba'), otherwise the fruiting varieties are best located in an area of the yard where the gumballs wont pose a problem.
Also, be careful not to plant it too close to your house or a septic system. Their roots are very invasive - have damaged the foundation of a house in California I saw on TV.
Why would anyone in their right mind want to plant a sweet gum tree? I cut every one I find down! They are a "weed" tree that is nothing but a nuisance.
Plant most any other type of tree other than that one. They are among the messiest I've ever had and I have about thirty or forty of all kinds. My favorites are crepe myrtle, and Bradford pear. They are not picky nor messy.
Be careful where you put the tree, because the roots are VERY invasive. Saw a TV show where the roots had uplifted the foundation of a house, and the tree wasn't planted close by. Their leaves are sure beautiful in fall, though.
Sweet Gum Trees are nice trees but the gum balls that fall off are a real pain in the neck and if you don't watch where you are going you will slip and fall from them. I cut mine down and now enjoy the ones in the park that I don't have to clean up after, lol.
Hardiness Zone: 6a
G. Brent from St. Louis, MO
In my opinion, planting trees is one of the few ways to create lasting positive change in the world. When you pause to consider how significant a tree is, you realize that just one tree offers food and refuge to hundreds of insects, animals and birds; offers beauty, shade and clean air to human beings; and gives the entire planet another carbon sink. It does all this for 100's of years, and that doesn't even include the tree's potential offspring! I think this is a great idea-and a wonderful way to honor your father.
Sweet Gum Trees make beautiful shade trees. You can propagate them from seeds or cuttings. Starting seeds will take a lot longer, but since you've already collected the gumballs, let's start there. Later, if you can't get the gumballs to germinate, try starting a new tree using a cutting and a little rooting hormone. It will take 60-100 days to root, but once it gets going, these trees grow fairly fast.
Gumballs turn brown with age. As they turn color on the tree, the heads pop open to disperse the seed. The gumballs can be taken from the tree safely for a few weeks before they turn color without hurting the seed. If the gumballs you collected are green, you can continue to let them dry and pop open, or try to gently pry them open yourself to access the seeds. Inside each prickly point are 1 or 2 winged seeds (usually dispersed by the wind). The entire gumball can contain as many as 50 seeds in a good year, and as few as 5 in a bad year (it runs in 3-year cycles). The amount of seeds found in the gumballs tends to correlate with how viable they are. The more seeds the ball has, the more likely it is that those seeds are of good quality.
I'm no authority on Sweet Gum Trees, but my understanding is that the seeds need to be cold treated in order to get them to germinate (approximately 12 weeks at 40F).
Steps in cold stratification are:
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