Plant guide
Autumn Olive Removal and Regrowth
Autumn olive thickets mulched in place, then followed up while the sprouts are young. Scoped on a private site walk.
Autumn olive is a spiny, multistemmed shrub that resprouts from cut stumps, so one mulching pass never ends it. We grind the thicket in season 1, return to cut the sprouts while they are small, and leave any chemical treatment of stumps or regrowth to a licensed applicator.
How to recognize it
Autumn olive (Elaeagnus umbellata) is a rapidly growing, often multistemmed shrub that reaches about 20 feet tall and 30 feet wide. Leaves are two to four inches long, alternate, with smooth edges. The top of the leaf is pale green and the underside looks silver or white, which is the quickest field mark, especially when wind flips the leaves.
Stems are ashy brown, young stems often look gray, and some carry sharp, stout spines. Spring flowers are trumpet-shaped, white to pale yellow, in clusters. Late-summer fruit is red, sometimes orange or yellow, flecked with silvery scales and no more than half an inch across. Russian olive is a look-alike with longer, narrower, drooping leaves, and Penn State Extension notes the two need the same control.
Why it matters locally
Penn State Extension says autumn olive was brought to North America in the mid-1800s as an ornamental and was later planted for erosion control, windbreaks and wildlife food. Birds spread its abundant fruit, and plants can fruit in as few as three years. It invades roadsides, pastures, abandoned farmland and forest edges, which describes a lot of ground in the Brandywine Valley.
It also fixes its own nitrogen, which Penn State Extension says changes the nitrogen cycle that native plants depend on and gives it an edge over them. For a horse farm or estate, the practical results are shrinking pasture, thickets along fence lines and shrubby edges that spread a little further each year.
How we remove it
We use the Cat 285XE with a forestry drum mulcher to grind the stems in place. Nothing is burned and nothing is hauled off. The BRX418 brush cutter works along fence lines, ditches and tight edges where the larger machine should not go, and the rock grapple moves large stems or debris that need to be shifted.
Mulching removes the top growth only. Penn State Extension notes that cut stumps resprout and that mowing alone is not effective. The resprouting stumps are smaller targets, which is why cutting and follow-up belong together. If an owner wants herbicide on cut stumps or regrowth, a licensed applicator does that work, and the timing is coordinated with our cutting. We do not apply chemicals.
Timing by season
Autumn olive leafs out early and holds its leaves late, so the stems are not hard to find in leaf. We still prefer the dormant season for the main mulching pass, from late fall through winter, because bare ground shows every stem and the thicket edges, and frozen or firm ground carries the equipment without rutting.
Penn State Extension lists a long foliar treatment window from June until fall color begins, and says oil-based cut-stump products can go on year-round after cutting while water-based products must go on right away. Those details are for the applicator to manage. Our part is to cut cleanly, and to schedule so the applicator can treat soon after.
Regrowth and follow-up visits
Plan on shoots from the stumps in the first growing season and seedlings from fruit already in the soil. That is normal and it is built into the plan. Season 2 brings a follow-up pass with the brush cutter or mulcher, depending on stem size, while the sprouts are young. Season 3 is a lighter pass and a walk of the edges. See the invasive regrowth plan for the full structure.
Birds keep bringing fruit, so new plants can appear after the main thicket is gone. Isolated new plants are cheap to remove when they are small, and Penn State Extension says hand-pulling or digging small plants fits routine maintenance.
What the owner can do
- Hand-pull or dig small plants when they appear, before they set fruit.
- Clear or graze regrowth where the ground and your animals allow it.
- Flag thick patches with tape so the next pass goes straight to them.
- Keep records of where sprouts return and send us photographs.
- Ask a licensed applicator about treating cut stumps if you want chemical control.
Questions about autumn olive
Sources include Penn State Extension and the USDA Forest Service. Chemical control is done only by a licensed applicator, and Huntly confirms the rules that apply to each site before work.
Can autumn olive be removed in one pass?
No. Mulching removes the top growth, and cut stumps resprout. Penn State Extension says mowing alone is not effective, so we plan a season 1 mulching pass with follow-up cutting in later seasons.
How do I tell autumn olive from other shrubs?
Look for leaves that are green above and silver or white below, ashy brown stems with sharp spines, and red fruit flecked with silvery scales in late summer.
Do you use herbicide on autumn olive stumps?
No. Huntly Land Co. does mulching, brush cutting and follow-up cutting. Chemical control is done by a licensed applicator, and we coordinate the timing with that work.
When is autumn olive mulched?
The main pass is usually timed to the dormant season, from late fall through winter, when stems and thicket edges are easy to see and the ground is firm. Timing for your property is confirmed on the site walk.
More about Autumn olive
Regulatory notes are general guidance; Huntly confirms the rules that apply to each site before work.
What are the look-alikes for autumn olive in Chester County, PA?
Autumn olive leaves are silvery on the underside and the twigs carry small silver-brown scales. Native shrub dogwoods and viburnums leaf out later in spring, so autumn olive often shows green first. That early leaf-out is the easiest way to spot it from the road. We mark stems on the site walk so natives we want to keep are left alone.
Does mulching kill autumn olive in Delaware or does it grow back?
Cutting alone usually doesn't kill it. Penn State Extension says cut invasive shrubs resprout vigorously and mowing has to be followed by herbicide on the resprouts. Mulching removes the canopy and opens the ground. A licensed applicator treats the stumps or regrowth, quoted as a separate visible line. Huntly confirms the rule that applies to each site before work.
How many visits does it take to clear autumn olive from a New Castle County, DE field edge?
Plan on the mulching pass plus at least one follow-up visit for resprouts, and more for dense stands. Penn State says the site must be maintained through periodic re-treatments because wildlife keep bringing in new seed. A yearly walk of the edges keeps a cleared field from filling back in.
What does autumn olive regrowth look like after mulching in Pennsylvania?
Stumps send up clusters of shoots in the first growing season, and seedlings come up where the canopy used to shade the ground. Penn State says knee-to-waist-high resprouts are easy to treat and easy to tell from desirable natives. That's why the follow-up visit is timed for the first full season of regrowth, not left for years.
Does autumn olive cost more to clear than other brush in Delaware?
Price follows stem size, how thick the stand is, and whether the ground is wet, not the species name. Large multi-stem autumn olive in a dense field edge takes more machine time than scattered young shrubs. Every job is priced in writing after the free site walk, with any herbicide follow-up shown as its own line.
Is autumn olive covered by EQIP cost-share in Pennsylvania?
Possibly, for shrubs. NRCS Pennsylvania EQIP cost-shares mechanical brush management of large shrubs (practice 314) at a per-acre rate set each year, but enrollment, ranking and practice rules decide whether a given field qualifies. Delaware rates are set separately. Talk to your local NRCS office before any work starts, because paid practices usually can't begin first. Huntly confirms the rule that applies to each site before work.
Where does autumn olive show up most in the Brandywine Valley?
Mostly along field edges, fence lines, old pasture corners, powerline and road rights-of-way, and abandoned farm fields, where birds drop seed. In Chester County and northern New Castle County it often forms a thick band between a cleared field and the woods. We look at those edges first when we walk a property.
When is the best time of year to clear autumn olive in PA and DE?
Mulching can be done in any season the ground carries the equipment, and the dormant season keeps wet ground firmer. Penn State says foliar herbicide works from early June into October and cut-stump treatment can be done year-round. So the cut and the licensed follow-up are timed together, not by the calendar alone.
Sources: archive.regulations.delaware.gov (806) · pa.gov (controlled plant noxious weed lists) · extension.psu.edu (invasive shrub control strategies) · extension.psu.edu (invasive shrubs are leafed out timing management) · nrcs-prod.azureedge.us (PA Bulletin 440 26 06 PA Published Cost List and Payment caps for FY 26)
Call, or send the details.
(484) 486-7272hello@huntlyland.com. Send the town, rough acreage and two or three photographs. We reply with site-walk times, and a written plan follows the walk.
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