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These plants started growing in my garden a few weeks ago:

image 1 image 2

There are several of these, all growing in the same planter, which make me think it's something that we put there but can't remember planting anything like that.

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    Cosmos? Unless you planted fennel seeds
    – Bamboo
    Jun 23 '17 at 11:31
  • No, it's not fennel
    – algiogia
    Jun 23 '17 at 18:15
  • Pretty sure it's cosmos too. The pink base of the branching stems is what cosmos has if it has the typical pink-magenta flowers
    – Jude
    Jun 23 '17 at 18:37
  • Is it some wild flower or you have to plant it?
    – algiogia
    Jun 23 '17 at 19:15
  • Usually you need to plant the seeds
    – Bamboo
    Jun 23 '17 at 19:33
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I've just realised you're in the UK - these plants are Cosmos, but quite how they got there I'm not sure. If you had some last year, it's possible the seeds germinated by themselves because we had hot weather in April, so maybe they grew from those, but usually, Cosmos seeds need heat to germinate in the UK so they're started off in seed trays or modules, in a greenhouse or indoors. They're only half hardy here too, which means they're not usually planted out as small plants until mid to end of May.

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