Identify weeds

There is no list of weedkillers here and no chemical recommendation — only recognition and mechanics. Once you have identified the plant you also know how it survives, and then it becomes obvious why some weeds come back year after year even though you clear them.

The most common weeds in Swedish gardens

• Ground elder (Aegopodium podagraria) — tall, white-flowered umbellifer with triangular leaves that smell faintly of celery. Spreads by creeping rhizomes that can stay in the soil for years. Digging them up makes it worse: every piece of root becomes a new plant.
• Couch grass (Elymus repens) — a grass with long, white rhizomes. Same problem: parts of the root survive and send up shoots. Covering with landscape fabric or cardboard for a whole season works better than digging.
• Creeping thistle (Cirsium arvense) — spiny, with purple flower heads. Deep taproot with runners; it has to be followed down and taken out with as much root as possible, or cut back repeatedly so that the root is drained.
• Chickweed (Stellaria media) — a low, delicate, light-green mat with small white star-shaped flowers. The seeds germinate almost all year round — clear it before it flowers, otherwise you will soon have a thousand new ones.
• Dandelion (Taraxacum) — taproot with milky sap. If you only cut the leaves it comes back. Lift the root with a weed fork when the soil is moist, preferably before the seed heads.
• Greater plantain (Plantago major) — leaves in a rosette with distinct lengthwise veins. Thrives in trodden, compacted ground; loosen the soil and it will find it harder to compete.
• Knotgrass (Polygonum aviculare) — a low mat in gravel paths and along edges. Tolerates heavy wear; usually a sign that the ground is compacted or nutrient-rich.
• Stinging nettle (Urtica dioica) — indicates nutrient-rich soil, often high in nitrogen. Rhizomes that spread; if you have a lot of nettles it is often a soil question, not just a weed problem.
• Field horsetail (Equisetum arvense) — green, jointed stem with no leaves. Deep rhizomes that are hard to reach; best dealt with by covering.
• White clover (Trifolium repens) — creeping, with white flower heads. Many people let it stay because it tolerates wear, but it spreads readily by creeping stems.

How to identify the weed from a photo

• Photograph the leaf straight from above in daylight — the shape and the edge are what matter most.
• Photograph where it joins the stem. The position of a leaf relative to the next leaf separates groups from each other, and when this detail is visible the answer becomes far more reliable.
• If it has flowered: take a picture of the flower as well.
• If you suspect couch grass or field horsetail: dig up a little carefully and photograph the roots. The root system tells you which species it is and at the same time reveals how to get rid of it.

Are you looking to plant any of them? Ground elder and nettle are edible, and that is a completely different question from this one. Read plants that look alike before you put anything in your mouth — ground elder is confused with the poisonous cowbane.