Raspberry suckers everywhere in garden: control and prevention

TL;DR

Raspberries spread via underground roots that send up suckers (young stems) everywhere. This is worse than runners. Control: cut suckers weekly or pull them as soon as they appear. Prevention: install root barrier, or confine raspberry patch with screens. For permanent control: spray glyphosate on fresh-cut suckers (only non-fruiting parts).

Why do raspberry suckers grow everywhere?

Raspberries are aggressive growers. They grow not just from the plant itself - far worse: via underground roots that spread and send new growth everywhere. These "suckers" are young stems that grow upright from ground, often meters away from mother plant.

This is far more aggressive than strawberry runners or mint runners. A single root tip can start a whole new raspberry clone. Within one season you can have suckers all over your garden - the lawn, borders, against the house. It is extreme.

Worst part: suckers grow fast and strong. They are not moisture-sensitive like thin runners. They are full plants that will grow.

Why suckers and not normal growth?

Raspberries (and blackberries, and some other fruit shrubs) have two types of growth:

1. Direct stems from plant heart (wanted)
2. Suckers from underground roots (unwanted)

Suckers arise because plant automatically sends new plants from its roots. This helps plant colonize and survive. Evolutionary genius for nature, but nightmare for you.

How do you recognize suckers?

Suckers are easy to recognize:

• Thin green stems growing straight from ground
• They grow fast (10-30 cm per week in summer)
• They are usually solid, not weak
• They have leaves that grow larger as sucker matures
• They grow in unexpected places: in lawn, against fence, under shrubs

Suckers are NOT: part of mother plant. They are separate plants just connected via underground roots.

Control 1: Cut weekly (seasonal work)

This is simplest way, but requires consistency.

Advantage:

• No chemicals needed
• Easy with scissors/pruners
• Effective short-term

Disadvantage:

• Only removes above ground, root remains
• Suckers regrow constantly
• Requires weekly work (May to October)

How to do:

1. As soon as you see sucker (1-2 cm long), cut with scissors or pull hard.
2. Cut as close to ground level as possible.
3. Check weekly. Suckers grow fast.
4. In July-August this may be needed daily.
5. Repeat until October (growth period ends).

After weeks of cutting, growth will slow because plant depletes energy.

Control 2: Pull out (less work, shorter effect)

This requires more effort, but it helps.

Advantage:

• Faster than cutting
• Can pull some root along
• Good exercise

Disadvantage:

• Same suckers regrow
• Heavy suckers break leaving root
• Not permanent

How to do:

1. Ensure soil is moist (water day before helps)
2. Grab sucker close to ground level
3. Pull slowly and hard upward
4. Sometimes a white root piece comes - good
5. Sometimes it breaks off - less good, but sucker is gone for now

Control 3: Root barrier (long-term)

This is the only permanent solution. Lots of prep work, then you are done.

Advantage:

• Permanent (until barrier ages or breaks)
• No yearly work

Disadvantage:

• Lots of digging needed
• Expensive for large raspberry patch
• Hard to install

How to do:

1. Install heavy plastic barrier (polyethylene 0.5-1 mm thick, very strong material, not thin garden film)
2. Dig deep: at least 60 cm deep, because raspberry roots go deep
3. Foil must rise 10-15 cm ABOVE ground level (else suckers grow over top)
4. Work round mother plants
5. Ensure all seams overlap (10 cm) and sealed (tape)

This is lots of work but works.

Control 4: Glyphosate (chemical, effective)

This is most effective method, but requires caution.

Advantage:

• Kills plant including roots
• Permanent (one application may suffice)

Disadvantage:

• Chemicals
• Can damage nearby plants
• Banned in some countries (e.g. France)
• Not suitable if you work organically

How to do:

1. Cut sucker off
2. Immediately spray (within 30 minutes) 50% glyphosate on fresh cut
3. Product soaks via cut into root
4. After weeks root dies
5. No new suckers from that root

This requires precision: you only want to kill sucker-roots, not your whole garden.

Prevention: better to prevent than cure

Raspberries in pot (light): you can grow raspberries in large pots (20+ litres). This avoids all sucker problems. Advantage: you can move them. Disadvantage: needs frequent watering.

Confine raspberry patch: do not plant raspberries in open garden. Plant in enclosed bed (bordered with root barrier or screen). This stops underground expansion.

Yearly maintenance: once season ends (October), cut all raspberries back to ~15 cm. Will minimize suckers because plant becomes weak.

Raspberry types and sucker aggression

Heritage (remontant): very aggressive with suckers, lots of growth, two harvests per year Tulameen: aggressive, robust, many suckers Polka: moderate suckers, good fruit Glen Ample: more manageable, fewer suckers Joan J: dwarf variety, least sucker problem

If you do not want much maintenance: choose Glen Ample or Joan J.

Step 1: Inspection

Walk your garden in May. Look for all suckers (grow fast).

Step 2: Choose control method

• Lots of time, no chemicals? Cut weekly
• Want permanent? Install barrier
• Want quick result? Glyphosate (carefully)

Step 3: Implementation

Start your chosen method. Ensure consistency.

Step 4: Monitoring

June-September: check weekly. Suckers grow fast.

Step 5: Fall cleanup

October: cut everything back. Prep for next year.

Frequently asked questions

Can I prevent suckers by pruning?

No, pruning does not help. Suckers come from roots, not above-ground growth. You must tackle roots.

How long does glyphosate work?

If applied correctly: permanent. Root dies and cannot send suckers.

Can I use wooden barrier?

No, wood rots and raspberry roots grow through. Plastic is essential.

How deep do roots go?

Raspberry roots can go 1 meter deep. Barrier minimum 60 cm deep, ideal 80+ cm.

What if suckers already in my lawn?

Those can damage your mower. Cut or pull before mower runs over them.

Are all raspberry types like this?

Black raspberries, blackberries, red raspberries: all have sucker problem, but severity varies.

Frequently asked questions

Can I grow raspberry only in pot?

Yes, works well. Use 20+ litre pot with good drainage soil. Water regularly. No suckers, everything controllable.

How many suckers per plant per season?

Can be 5-20 suckers, depending on variety and feeding. Heritage more than Glen Ample.

Will raspberry die if I cut everything off?

No, raspberry is tough. Regular cutting weakens but does not kill. Roots stay alive.

Can I compost suckers?

Yes, safe. Suckers are waste, composting is fine.

Discover your own garden design

At [gardenworld.app](https://gardenworld.app) you can upload your front yard and see how raspberry bushes fit with root barrier and maintenance - with realistic growth shapes and surrounding plantings. Plan your layout before planting raspberries.