Looks like Kochia scoparia, common name Burning Bush, because it turns bright red in autumn. Used as summer bedding in the UK because it dies over winter.

Could be equisetum (mare's tail). It's very invasive & is best dealt with quickly if it is that. Pinch a leaf & pull, if the whole leaf comes away fairly easily that could be an indicator

I thought cosmos minus any flowers. but doesn't look like equisetum. don't know Kochia but if it is that its very pretty.

I also thought Cosmos, Seaburn, but I suspect Bamboo is right.

It definitely isn't equisetum.... I went for Kochia rather than Cosmos because of the limey green colour of the foliage...

Its just started getting flower buds, its from seeds I had but haven't a clue.

Kochia does flower, though they're not very impressive, but its quite useful if it flowers because there's no way Cosmos flowers could be mistaken for Kochia flowers. Google Cosmos and you should find images showing the flowers for comparison later...

Don't be deceived by the way a phone camera recorded colours though? Don't mean to be argumentative but I don't understand why that's categorically not equisetum?
I hope it's not but it looks pretty similar to what breaks through the flags in my Manchester yard.
Why isn't it reddening or giving up last-gasp flowers if it's something else?

I'm pretty sure that it is Cosmos. The leaves are opposite and multilobed, while Kochia leaves are alternate and simply linear.

the reason its not horsetail Darren8 is the way the leaf is arranged around the stem and in horsetail each 'leaf' isn't further divided. this leaf is and that's what makes me think cosmos, but as bamboo thinks Kochia we will have to wait and see . no need to apologise for having a different view of things.

You can call me Daz, Seaburn!
Thanks for the pointers☺ Good learning for me...

Hi, I would have said Kochia scoparia, it has had it's name changed tp Bassia scoparia, Derek.

Drives me mad,all these name changes, difficult to keep up Derekm;-))

lol time to update your reference books. It's a science that's perpetually evolving.

Well, if it is Cosmos, it will have satiny, globular flower buds at the tips of the stems. If it is Bassia, the flowers are tiny, five-pointed stars sprinkled among the leaves, sometimes developing into little crowded spikes.