Guide
Sweetgum Gumballs: Your Real Options
The short answer
The gumballs are the fruit of the sweetgum (Liquidambar styraciflua), and on an existing mature tree your options are genuinely limited. Growth-regulator treatments exist but are finicky, must be repeated annually, and Extension specialists call preventing fruit on large, well-established trees impractical.
Two chemical routes are used: ethephon sprays (Florel), which release ethylene to drop flowers, and injected IBA products (Snipper), put into the tree while flowers are still in bud. Both must hit a narrow timing window at bloom, need exact dosage, and can injure the tree if done wrong, which is why they are arborist-applied and unreliable.
If you are planting a new sweetgum rather than fighting an old one, choose the fruitless cultivar 'Rotundiloba', which rarely produces the spiny gumballs and is a good street or lawn tree. That, not a spray, is the durable solution.
Existing tree: growth regulators, and their real limits
If you already have a big sweetgum, be clear-eyed about the chemistry. NC State Cooperative Extension describes two products. Ethephon (sold as Florel Brand Fruit Eliminator) releases ethylene gas when sprayed onto the branches while sweetgum flowers are present in spring, causing flowers to drop before they set fruit. Indole-butyric acid (Snipper) is instead injected into the tree while the flowers are still in the bud stage in spring.
The catch is the precision required. NC State stresses that ethephon must be applied at just the right dosage, at just the right stage of flowering (full bloom), and in just the right temperature range, with a risk of plant damage if dosage or temperature are too high; for Snipper, timing and dosage are critical and the treatment must be done annually. Because full-canopy spray coverage on a tall tree is hard and injection needs professional equipment, this is arborist work, not a homeowner spray, and it must be paid for and repeated every single year.
The bottom line from Extension is sobering: preventing fruit on large, well-established trees is not practical, and the honest recommendation is to either learn to live with the sweet gum fruit or remove the tree. A grass catcher-style rake or lawn sweeper for cleanup, or a groundcover under the canopy so balls disappear instead of littering a lawn, is often more realistic than annual chemistry.
New planting: the fruitless 'Rotundiloba' cultivar
The clean answer applies only before you plant. The fruitless cultivar Liquidambar styraciflua 'Rotundiloba' was introduced by J. C. Raulston in 1997 and, per the NC State Extension Gardener Plant Toolbox, is distinguished by a lack of the spiny, messy gumball fruits its parent is known for; it rarely produces fruit. It keeps the sweetgum's good looks and reliable fall color while dropping the litter problem.
You can also tell it apart by its leaves: NC State notes 'Rotundiloba' has five lobes that are rounded at the tips, rather than the pointed, star-shaped lobes of ordinary sweetgum. NC State lists a shade or street tree, or a lawn specimen, as good uses. If gumball litter is your only objection to sweetgum, planting 'Rotundiloba' from the start avoids the whole growth-regulator treadmill.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- NC Cooperative Extension, Henderson County - Preventing Sweet Gum Tree Fruit — Ethephon (Florel) releases ethylene gas when sprayed onto branches while flowers are present in spring and must be applied at just the right dosage, stage of flowering (full bloom), and temperature, with risk of plant damage; Snipper (indole butyric acid) must be injected while flowers are still in bud stage, timing and dosage are critical, and treatment must be done annually; preventing fruit on large, well-established trees is not practical, so learn to live with the fruit or remove the tree.
- NC State Extension Gardener Plant Toolbox - Liquidambar styraciflua 'Rotundiloba' — 'Rotundiloba' was introduced by J. C. Raulston in 1997 and is distinguished by a lack of the spiny, messy gumball fruits its parent is known for; it rarely produces fruit; its five lobes are rounded at the tips; it is a good shade or street tree or lawn specimen.