Three years ago, I walked into a garden center on a whim and fell completely in love with a tiny tree in a nursery pot. It had this enchanting, cascading shape—like someone had crossed a weeping willow with a fruit tree—and I had exactly one empty terracotta pot on my patio that seemed to be calling its name. I didn’t hesitate. I took that Mojo Berry mulberry home and set it in its new home without asking a single question about how to prune it.
That decision haunted me for an entire growing season.
My second winter with the tree, I got a little too enthusiastic with my pruning shears. I cut deeper than I should have—well below where I thought was safe—and by spring, my “dwarf” tree had exploded into wild growth. It suddenly wanted to grow eight feet tall with completely different leaves than the delicate foliage I’d fallen in love with. I was baffled. Angry, even. How had a dwarf mulberry become such a monster?
One very patient nursery employee later, I understood exactly what I’d done: I’d cut below the graft union. I’d destroyed the dwarf variety and let the aggressive rootstock take over. And worse, I’d learned this lesson the hardest way possible—by nearly killing the whole point of growing a Mojo in the first place.
If you’ve got a Mojo Berry, a Dwarf Everbearing, or any other grafted patio mulberry and you’re standing over it right now with pruners in hand wondering where to cut, I want to save you from my mistake. Here’s everything I wish someone had told me before I touched mine.
Understanding Your Grafted Mulberry: Why You Can’t Just Cut Anywhere
Before we talk about how to prune a Mojo mulberry, we need to talk about what makes it different from a full-size mulberry tree. This is the crucial bit I missed, and it completely changed how I approach these little trees.
Most Mojo Berry mulberries are sold as grafted specimens. What does that mean? A nursery has taken a cutting from the Morus alba ‘Mojo’ cultivar—the special dwarf, compact variety that stays around 4 to 6 feet tall with that beautiful weeping habit—and joined it onto the top of a hardier, more vigorous rootstock below. The rootstock is the “bottom part,” and the Mojo is the “top part” (called the scion). They’re two different plants working as one, joined at a visible knuckle of grafted wood called the graft union.
Here’s why this matters for pruning: that rootstock below the graft union is incredibly strong and aggressive. It wants to grow tall and wild. The Mojo scion above the graft union is genetically programmed to stay compact and weeping. When I cut below the graft union, I removed the Mojo entirely and gave the rootstock full control. Suddenly, all that wild energy had nowhere to go but straight up.
Every single pruning cut on a grafted dwarf mulberry must happen above that graft union. This is non-negotiable. It’s the one rule that will save you from my year-long nightmare.
Identifying the Graft Union on Your Tree
So how do you find the graft union? Walk outside and look at your mulberry’s trunk. If your tree is a typical Mojo or similar dwarf cultivar, you’ll see it clearly: a slight bulge or thickening where the trunk changes character, usually somewhere between 18 inches and 3 feet from the ground. It often looks like a bump or a collar. The wood below that line looks different from the wood above it—different color, different texture, sometimes even a slight scar from where the graft was made.
If you’re not 100 percent sure where it is, touch it. Feel the trunk with your fingers. The graft union is usually pretty obvious when you know what you’re looking for. It’s your safety line. Everything above it is safe to cut. Everything below it is off-limits.
Mark it mentally, or even tie a small piece of garden tape around the trunk if you’re pruning for the first time and want a visual reminder. I’m not kidding. I did this my second year, and it took away all the second-guessing.
When to Prune a Mojo Mulberry for Best Results
Timing is everything, and I learned this through trial and error (mostly error). Late winter, while the tree is fully dormant and before new growth has started, is your ideal window. Think February through early March, depending on where you live. The buds haven’t swelled yet, the tree is asleep, and you’re working with minimal risk.
Why not spring? Because mulberries fruit on the current season’s new growth. If you prune too late in spring after the buds have already swollen and started to open, you’re cutting away the wood that’s about to produce your berries. You’ll have a nicely shaped tree but a disappointing harvest. I learned this the hard way too, which is why I’m telling you now: late winter pruning means maximum berries come summer.
Avoid pruning in fall or early winter. The tree is preparing for dormancy, and fresh cuts can stimulate tender new growth that won’t survive the cold. It’s counterproductive and stressful for your tree.
The Right Approach: Shaping, Not Restricting
Here’s something important that took me a while to understand: the goal of pruning a Mojo or other dwarf patio mulberry is not to keep it small. It’s already genetically programmed to stay small. The real goal is to maintain an open, airy canopy shape that lets light and air circulate through the branches, encourages fruiting, and keeps the tree healthy.
This is a completely different mindset from pruning a full-size mulberry. You’re not doing heavy heading cuts to control height. You’re doing selective removal to improve form. Think “shaping” rather than “cutting back.”
When you look at your Mojo, here’s what you’re pruning for:
- Remove any dead, diseased, or crossing branches
- Thin out crowded areas to let light reach the interior
- Remove branches growing straight up or in awkward directions
- Maintain that beautiful weeping or cascading shape the cultivar is bred for
You’re not removing 30 percent of the canopy. You’re removing maybe 10 to 15 percent—mostly just the stuff that’s clearly out of place or shading other branches. Less is more here. Every branch you leave is a potential fruiting branch come summer.
Step-by-Step: How to Prune a Mojo Mulberry
Let me walk you through the actual process. I do this every late February, and it takes me maybe 20 minutes:
- Step 1: Assess the tree. Walk around it. Look for anything obviously dead, diseased, or broken. These come off first, no questions asked.
- Step 2: Look for crossing branches. Any branches that are rubbing against or crossing over each other? Pick the weaker one and remove it at its base, right where it connects to the branch it’s crossing.
- Step 3: Thin crowded areas. Are there spots where the branches are so dense you can’t see light through them? Selectively remove some of the interior branches to open it up. Your goal is a canopy you can see through.
- Step 4: Remove upright growth. One of the hallmarks of dwarf weeping mulberries is that graceful, downward-cascading habit. Any vigorous branches growing straight up or at sharp angles? Remove those. They’re fighting the tree’s natural shape.
- Step 5: Make clean cuts. Always cut just above a leaf bud or right at the branch collar (the slightly swollen base where a branch meets another branch or the trunk). Don’t leave stubs. Stubs invite disease.
The whole process should feel gentle. If you’re removing large sections of wood, you’re cutting too much. Remember: aggressive pruning removes next season’s fruit. Let the tree’s natural compact growth habit do the heavy lifting.
Special Care for Container-Grown Mulberries
If you’re growing your Mojo in a pot like I do—and honestly, patio mulberries are perfect for container growing—there’s one more step that makes a huge difference: root pruning at repotting time.
Every spring, I tip my mulberry out of its pot and look at the roots. If they’re circling the edge of the soil ball (pot-bound), I gently tease them apart and trim back the longest ones by about a third. This might sound counterintuitive, but it actually encourages a bushier root system and prevents the stunted vigor and reduced fruit set that can happen when roots get too crowded.
Then I repot into fresh soil—usually the same size container or just one size up. This annual refresh keeps my container mulberry producing heavily year after year. If I skip it, I notice the berries get smaller and fewer after a couple of seasons.
What I Use: The Tools That Make Pruning Easier
You don’t need fancy equipment, but good tools make the work cleaner and safer. Here’s what I reach for every time I prune:
Fiskars 91095935J Steel Bypass Pruning Shears are my go-to. These 5/8″ garden clippers cut clean and sharp, they’re comfortable to grip, and they last forever. I’ve had mine for five years. The bypass design means you get a scissor-like cut rather than a crushing cut, which is gentler on the tree.
For any larger cuts (which you’ll rarely need on a Mojo, but it happens), I use a pruning saw, but honestly, good bypass shears handle 95 percent of what you’ll do.
I also keep Tanglefoot Tree Wound Pruning Sealer and Grafting Compound on hand. Mulberries are generally hardy and don’t require wound dressing for small cuts, but I use it on any cut larger than a pencil thickness, especially on the grafted portion. It seals out moisture and disease and gives me peace of mind. Especially after my graft-cutting disaster, I’m not taking chances.
Growing Beyond Mojo: Other Grafted Dwarf Varieties
While I’m passionate about my Mojo, it’s not the only grafted dwarf mulberry on the market. If you’re curious about what other options exist, I’ve written a detailed guide to the best dwarf mulberry varieties for small spaces. The same pruning principles I’m sharing here apply to all of them: respect the graft union, prune in late winter, and focus on shaping rather than cutting back.
I’ve also compiled my full guide to growing and caring for weeping mulberry trees, which goes deeper into the specific habits and care of weeping varieties if you want to explore further.
And if you ever find yourself managing a full-size mulberry tree—maybe you have one in your yard from a previous owner—the approach is quite different. I’ve written the complete pruning guide for full-size mulberry trees for that exact scenario.
Bringing It All Together: Your Mojo Will Thrive
That terracotta pot on my patio still holds a mulberry. It’s no longer the stressed, confused tree I created after my pruning mistake. For the past two years, it’s been a picture of health—compact, gracefully weeping, and absolutely loaded with berries every summer. The difference? Understanding how to prune a Mojo mulberry the right way.
You don’t have to learn this lesson the hard way like I did. Find that graft union, mark it if you need to, wait for late winter, and then prune gently with an eye toward shaping rather than cutting back. Your tree is already programmed to be small. Your job is just to help it look its best and produce its most.
Go out there and prune with confidence. Your Mojo is tougher than you think—and kinder to mistakes than a full-size mulberry. But we both know that respecting that graft union from the start is the path to years of harvests and that enchanting, weeping shape that made you fall in love with the tree in the first place.
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