I don't think gazanias are hardy so best left til spring for sowing. Is the seed completely ripe and dry? if so store it in an envelope or something made of paper, not plastic. cool and dry, should be fine.
Have you had a look to see if there's damage to the bark on that branch?
Looking at the photo the top left looks a bit yellow as well, is it?
lovely, thank you Dove
yes please Dove
I like raspberries
I'd say raspberry. looks more like that than blackberry
good point H-C
ideas of world domination.
a photo would help with some elimination even if it can't make a definite ID.
Link to the article Mike mentions
It can only be invasive by seeding wakeshine, the roots don't wander. But it's too easy to lose in a lot of gardens given a cold wet winter.