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What weeds has my watering can caused?

I’ve just sown some lettuce and radish seeds in a newly dug over veg bed and watered these in. Except a week later there are what looks to be small green seedlings covering the entire bed, not just where I’d expect them to be from what I planted. The watering can I used to water the seeds in had been left standing for some months and had algae in it which I think had contaminated the bed (there aren’t these small seedlings in the other veg beds that I didn’t water with this can). What weeds are these? What do I need to do with them? I’m feeling really stupid now (and frustrated that I’ve potentially caused myself so much work). Help please!

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1 Comment To "What weeds has my watering can caused?"

#1 Comment By BushDoctor On 04/29/2019 @ 1:11 pm

Those are brassica (the genus that includes both lettuce and radish) seedlings. When you water, those tiny seeds get washed everywhere. A google image search for “lettuce and radish seedlings” will help you to confirm this.

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