While I don’t feel that sawtooths are invasive, some people rightfully do have concerns about planting a non-native species. My dad has planted 10-15 sawtooths over the past 15 years, while his neighbor planted 30-40 sawtooths over 25 years ago. I have not found a single volunteer on approximately 140 acres. Sawooths do not do well unless they have full sunlight.
I am not sure if you grow your own trees or plan to acquire them from a nursery, but some research suggests that if you get high quality seedlings of any species that they than can produce acorns in less time than previously thought.
This
paper examining northern red oak and white oak suggests that using seedlings with more than six well developed first order lateral roots (FOLR) can lead to early acorn production. FOLR are the side roots off the taproot. While air pruning develops lots of FOLR, even seedlings grown in pots can develop high numbers of FOLR. I think everyone already know this, but if you have a choice between seedlings, use the one with the best root system. The researchers of the paper suggested that “Selecting oak seedlings possessing the best root systems and the most desirable stem characteristics for outplanting in natural forested areas can also lead to acorn production in less than 10 years.”
The authors followed up their research and produced this
paper. They grew northern red oaks that averaged over 20 feet tall in 10 years. They used the best of the best seedlings and saw some of the northern red oaks producing acorns in their fourth year.
Some of their conclusions are interesting when it comes to trying to determine when a species of tree will produce acorns. They state that “In the past scientists may have overemphasized the effects of tree age on initiation of acorn production. After observing natural forest stands, scientists may correlate acorn production too closely with years after outplanting. Our observations clearly indicate that crown vigor, combined with genetic potential, may be an overriding factor in early acorn production.”
These words from the researchers have already been stated here, but bear repeating. “To obtain early acorn production even with the best quality seedlings, interspecific competition must be reduced so that the crowns are exposed to full sunlight during early development.” Use the best seedlings, reduce competition, provide plenty of sunlight, and you may be surprised how quickly you can get acorns from trees, even species that are not known to produce acorns at an early age.