How to Get Rid of Morning Glory (Bindweed) for Good
How to get rid of morning glory depends on which plant you have — annual or bindweed. Why digging makes 1 of them worse, and the method that exhausts the roots.
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Before anything else: find out which plant you have. The two things called morning glory need completely opposite treatment, and most wasted effort here comes from treating one as the other.
Which plant do you have?
| Annual morning glory | Field bindweed | |
|---|---|---|
| Botanical | Ipomoea | Convolvulus arvensis |
| Leaf | Heart-shaped, no lobes | Arrowhead, pointed basal lobes |
| Flower | Large, 2–4 in, blue/purple/pink | Small, under 1 in, white or pale pink |
| Root | Shallow, annual | Over 10 ft, perennial |
| Winter | Dies at frost | Returns from root |
| Treatment | Pull before it seeds | Exhaustion over two seasons |
If it dies back completely every winter and has big showy flowers, it is the annual and you do not have a problem — just pull it before the seed sets.
If it is back every spring from the same spot with small white trumpets, it is bindweed, and the rest of this applies.
Why digging is the wrong instinct
It is the thing everyone tries, and it reliably makes the patch worse.
Bindweed regenerates from root fragments. A spade through a root system turns one plant into a dozen, each growing from a piece you left behind. Since the roots reach depths no garden tool touches, “getting it all out” is not a thing that can happen.
Watch out
A bindweed patch that has been dug over typically comes back denser the following season. If you have already dug, do not take that as evidence the method needs more effort — switch approach rather than digging harder.
The method that works: exhaustion
The plant lives on energy stored in those deep roots. Every time it regrows leaves, it spends some of that reserve. The strategy is simply to make it spend more than it earns.
1. Cut everything at ground level. Shears, hoe, or a strimmer in rough ground. Do not pull — a pull that breaks the root underground is a small version of digging.
2. Let it regrow to a few inches, then cut again. Roughly every two weeks. This is the part people get wrong by being too diligent: a shoot that reaches a few inches has already cost the plant more than one cut at emergence, so you want some regrowth before cutting.
3. Mulch what you can. Cardboard with four to six inches of mulch over it blocks light from whatever emerges, forcing longer, weaker shoots that cost more energy still.
4. Keep going all season. Stopping in August undoes most of a summer’s work, because the plant rebuilds its reserve in late season before dormancy.
5. Expect two seasons. Year one looks like you are losing. The signal to watch is not whether it comes back but how vigorous the regrowth is — thinner, paler, slower shoots mean the reserve is draining.
If you use herbicide
A systemic product is the one route that reaches the root, and timing is everything:
- Apply at flowering, when the plant is moving sugars downward to the roots. Spring application on new growth largely fails because the flow is the wrong way.
- Paint it on leaves rather than spraying. Bindweed grows up through things you want to keep, and drift kills those instead.
- Expect repeat applications. One treatment will not clear an established root system.
Vinegar, salt and flame all work on contact and do not travel. They remove the foliage, the plant regrows from the root within a week, and nothing has changed.
Step by step
- Time
- PT1H
Identify which plant you have
Annual morning glory (Ipomoea) has heart-shaped leaves and dies at first frost. Field bindweed (Convolvulus arvensis) has arrowhead leaves with pointed basal lobes and returns from roots every year. Only the second needs this method.
Stop digging it out
Every root fragment left behind regenerates a new plant, and bindweed roots reach well over 10 feet deep. Digging multiplies the infestation rather than reducing it.
Cut every shoot at ground level
Remove all top growth with shears or a hoe. The aim is not to kill the plant but to force it to spend stored root energy producing replacement leaves.
Repeat every two weeks through the growing season
Each regrowth draws down the root reserve. Letting shoots reach a few inches before cutting again wastes more of the plant's energy than cutting constantly.
Mulch heavily where you can
Cardboard topped with 4 to 6 inches of mulch blocks light from any shoot that does emerge, which compounds the exhaustion.
Spot-treat survivors at flowering, if using herbicide
If you choose a systemic herbicide, apply when the plant is flowering and moving sugars downward, which carries it to the roots. Painted onto leaves rather than sprayed, so nothing drifts onto neighbouring plants.
Common questions
Is morning glory the same as bindweed?
Why does digging up bindweed make it worse?
How deep do bindweed roots go?
Will vinegar kill bindweed?
How long does it take to get rid of bindweed?
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