Branch Crowns and Runners: How to Read Your Strawberry Plants This Fall

Commercial growers ask us the same question every September. Are my plants where they should be heading into flower bud initiation?

The answer depends on your production system, and on what you put in the ground. A plasticulture plant and a matted row plant are doing different work this fall, and the thing you count is different in each.

Here's how to read them, and what to do when the count comes back wrong.

What a branch crown actually is

The crown is the shortened, compressed stem at the base of the plant, where all leaves, inflorescences, stolons and roots emerge. (We break the full plant down in Strawberry Plant Structure if you want the anatomy in one place.)

During the growing season, that main crown produces side stems. Those are branch crowns. Each one behaves like a small plant of its own, with its own leaves and, more to the point, its own flower cluster.

That last part is the reason we count them. Each branch crown adds to the yield of the main crown by producing its own inflorescence. Crown count in the fall is a direct read on flower trusses next June. Penn State puts it plainly: high yields in the annual system depend on plants producing branch crowns rather than daughter plants.

Runners are the other structure. A runner (stolon) is a horizontal, creeping, leafless stem that sets a daughter plant at its node. Daughters fill rows. Branch crowns fill yield. Same plant, two very different uses of the same carbohydrate.

Why fall decides next June

Two things are happening inside that crown right now, at the same time.

Flower bud initiation runs on day length and temperature together. Virginia Cooperative Extension puts the trigger at less than 14 hours of daylight, or temperatures below 60°F. Purdue notes that day length in Indianapolis drops below 14 hours around August 10, and that date slides a little later the further north you farm. Ohio State's work on critical photoperiod lands in the same range, with Chandler, Radiance and Shuksan all between 13 and 14 hours.

Crown growth needs warmth. Development happens when temperatures are above 50°F, which across most of our shipping territory means October does the heavy lifting.

The two processes compete. The plant is building flower buds and building crowns out of one carbohydrate pool, and pushing hard on crown number thins out what each crown can support. That trade-off sits underneath every recommendation below.

Heat pushes the plant the other way entirely. Above roughly 80 to 86°F daytime and 75 to 78°F nighttime, University of Delaware reports that plants form runners instead of flower-bearing branch crowns. A hot September doesn't just slow you down, it redirects the plant.

Plasticulture: your crown target depends on what you planted

This is where growers get tripped up, because there are two right answers and they belong to two different plants.

Bare root on plastic, going in mid-June to mid-July, should reach 3 to 4 branch crowns by the end of the season. Long runway, and the plant is expected to use it.

Plugs on plastic, going in early August through mid-September, should reach 2 to 3 branch crowns at the end of October. Shorter runway, tighter target.

Same physiology in both. The only variable is how many warm weeks the plant got before day length shut the process down. If you run both systems, count them against different yardsticks.

The plug number has independent backing. University of Delaware tells Delmarva growers the goal by late fall is 2 to 3 branch crowns formed from the mother plant, which is where we land too. Delaware adds two more checks worth making at the same time: plants should be about 8 inches in diameter going into winter, with 3 or more fully green leaves coming out of establishment.

When the count runs high

For plugs, 4 or more branch crowns at the end of October usually means you planted too early. The plant got extra weeks of warm weather and spent them making crowns. Next spring you'll see plenty of flowers and smaller berries on them, because the same root system is feeding more fruit than it can size. Delaware makes the same call, warning that early planting risks too many crowns forming, especially in Chandler, and unmarketable fruit size as a result.

For bare root there's no hard ceiling published, ours or anyone else's. The working rule: if you're consistently landing well above 4, your planting date is early for your region and your berry size will tell you so in June.

Either way, if you're over, consider removing the additional branch crowns. Cutting flower potential off a plant in October feels wrong. Do it anyway. It protects berry size and picking speed in June, and that's what pays.

How to actually count them

You can't do this from the truck.

Pull 5 to 10 plants from across the field rather than from one end. Include a low spot and a high spot if you have them. Brush the soil off the crown and look at the base: the main crown is the thick center stem, and branch crowns come off its sides, each with its own whorl of leaves. A hand lens helps. Early-stage branch crowns look like a swollen bud at the base of a petiole.

Do the count at the end of October, then write the number down next to that block's planting date and stock type. Two or three seasons of that and you'll know your own farm's planting window better than any regional guide can tell you.

Planting windows across our shipping territory

Published planting dates move with latitude, and the spread is wider than most growers expect. Here's what we recommend, alongside what the extension services covering our territory publish for plugs in plasticulture.

Read that table closely and you'll spot a disagreement. Delaware says don't plant in late August, because you'll end up with too many crowns and small fruit. Purdue says plugs can go in as early as mid August in Indiana. Both are right for where they sit. Delmarva carries more accumulated heat into September than northern Indiana does, so the same calendar date buys a different amount of crown development.

The lesson for growers in between: pick your window off the guide closest to your heat accumulation, not the one closest to your state line. Then correct it with your own October counts.

If you planted late and crown number is short, row covers are the lever you have left. Penn State's trigger is to apply floating covers in the fall once daytime highs are in the low 70s. Research suggests early covers won't add crown number, though they can increase flower bud initiation, and bud initiation is the part of next year's crop still on the table in November.

Winter mulch is a separate decision. We recommend 4 to 6 inches of straw or salt marsh hay after 6 to 10 hard frosts, typically between mid-November and early December. If you want a second trigger to check against, Cornell uses soil temperature: apply after three consecutive days at 40°F or below.

Matted row: count daughters

Matted row runs the opposite logic on runners. You need them. Daughter plants and runner growth are how the row fills, and a row that doesn't fill doesn't yield.

The mistake is letting every daughter set. Excess plants compete with each other, which limits development of the daughter plant and raises fungal pressure in a canopy that never dries out. Picking slows down too, because your crew is working around plants that will never carry much fruit.

Allow 2 to 4 daughters to take root per mother plant, evenly spaced 5 to 8 inches apart. Once those numbers are set and your rows are filled in, remove additional runners through cultivation.

That spacing lines up with the regional guidance. University of Maryland says thin daughter plants to 6 inches apart. UNH and University of Maine both set the cutoff at the same place, calling for removal of runner plants once spacing drops below 6 inches. Cornell gives the density version of the same rule: by late summer, about 4 to 6 plants per foot of row.

Note that day-neutral and everbearing plantings run the opposite rule. Remove all runners for the lifetime of the planting, so the plant puts everything into establishment.

Row width

Do not let your rows exceed 18 inches in width. Remove all runners that fall outside that width.

For context, that number sits at the tight end of what the region publishes, and the spread is real rather than a set of typos.

• Nourse and Cornell: 18 inches maximum
• Purdue: 12 to 18 inches as the final width at end of season
• Minnesota: 12 to 14 inches at full canopy
• Wisconsin: 12 to 15 inches
• Maine and New Hampshire: a 24 inch maximum
• Illinois: no wider than 2 feet

The tighter numbers come from sources weighted toward fruit quality and spray coverage. The wider ones give more ground to total plant count and picking access. More berries set at the row edge than in the middle, so if you're deciding between 18 and 24 inches, the extra 6 inches of mat buys you foliage and a wet center where fruit rots.

At renovation, rototill the edges back to a 12 to 18 inch bed and let it refill. Don't renovate in the establishment year.

What runner removal is actually worth

If you need the number to justify the labor line, the trial work is strong. An Ontario trial on spring-planted Albion found de-runnered plants yielded 37% to 45% more in total than plants with no runner removal. A Netherlands study found a 15% increase in planting-year yields. Removing runners three times across the season beat one removal or none, and weekly was better still.

We covered this in more depth in Spring 2023: Five Points to Prepare. The short version: runners act as an energy sink on the mother plant, pulling resources away from fruit bud development, and they get in the way of cultivation and pest control.

Four things we see go wrong

Planting early to be safe. Early planting is the single most common cause of a plug plant carrying 5 or 6 crowns. The season looks great in November and disappoints in June.

Judging by canopy instead of crowns. A big, leafy plant with one crown will underperform a modest plant with three. Leaf area is not the metric.

Holding bare root and plugs to the same number. They're different plants with different runways. Count them separately.

Not writing the number down. Crown count next to planting date next to spring yield is the cheapest data set on your farm, and almost nobody keeps it.

What to do this week

Walk your plasticulture blocks and pull a few plants. If your plugs are already at 3 branch crowns in mid-September, you have more October coming and you should plan on removing crowns at the end of the month.

In matted row, look at row width before anything else. If your rows are past 18 inches, get the cultivator through them while the soil still works.

As always, contact us with any questions. For more helpful tips and information, visit NourseFarms.com

More from Nourse

• How to Grow Strawberries | the full agronomy reference, planting through harvest
• Strawberry Plant Structure | crown, stolon, daughter and root anatomy
• Spring 2023: Five Points to Prepare | runner removal and the yield research behind it
• Fall 2022: June-Bearing Strawberry Nutrition | feeding for crown size and runner development
• Spring 2024: Strawberry Plants, Plugs vs Bare Root | choosing between the two systems
• Strawberry Site Selection and Preparation | slope, rotation and nutrient amendments
• Strawberry Renovation | post-harvest bed narrowing

Further reading by region

Northeast

• Cornell Fruit Resources: August strawberry recommendations
• Cornell Fruit Resources: Fall strawberry maintenance
• Cornell: Perennial strawberry production
• Cornell: Winter mulch for strawberries
• Cornell Vegetable Program: Overwintering strawberries, fall mulch timing and spring removal
• UNH Cooperative Extension: Growing strawberries
• UNH Cooperative Extension: Low tunnel strawberry production guide
• University of Maine Extension Bulletin 2067: Growing strawberries
• New England Vegetable & Fruit Conference proceedings, 2003 (Lord, UNH, on strawberry plasticulture)
• Strawberry Production Guide for the Northeast, Midwest and Eastern Canada, 2nd ed.

Mid-Atlantic

• Penn State Extension: Strawberry production
• Penn State Extension: Strawberry establishment, planting and other basics
• University of Delaware Weekly Crop Update: Plasticulture strawberry planting and fall growth considerations
• University of Delaware Weekly Crop Update: Strawberry flowering, runner formation and temperature
• Rutgers NJAES FS1259: Plasticulture strawberries
• University of Maryland Extension: Growing, selecting, planting and training strawberries
• Virginia Cooperative Extension: Commercial small fruit production

Midwest

• Purdue Facts for Fancy Fruit: Strawberry fruit bud development
• Purdue Facts for Fancy Fruit: Matted row strawberry renovation
• Purdue Vegetable Crops Hotline: Plasticulture strawberry planting date
• Midwest Fruit Pest Management Guide, strawberry section (ID-465-W)
• Ohio State: Controlled environment berry production, flowering basics
• University of Minnesota Extension: Planting a new strawberry field
• University of Minnesota Extension: Strawberry end-of-season renovation
• University of Wisconsin Extension: Growing strawberries in Wisconsin (A1597)
• Illinois Extension: Growing strawberries

Photo note: 

Photo taken September 3, 2026, during a Nourse Farms employee visit to McKinstry Farms. The plugs pictured were planted on August 21, 2026.