Blueberry plant issues

I've never grown blueberries but I saw some tiny plants in Morrisons bach in March and only around £1.50 in a three inch pot, basically just a cutting rooted last year.
To my surprise its got a reasonable amount of fruit forming, but I notice the fruit forms on the previous years growth.

I've repotted it and it has new growth along with the berries forming.

 

Ours is in the ground, and growing well. We even have some berries ripening, so might get a portion or two.

It's had a good amount of rain - but yes, only collected rainwater when extra water is needed.

Does anyone know if seaweed mix will help or harm it? There's certainly plenty of seaweed on the beach near here, so I could go and harvest some to make a feed. Not sure whether that would attract or deter predators.

 

This was one of my 4 plants 01May24. It has since put on more flowers and most are now set. Note the difference in the main stem to the OPs, I just can't help thinking your plants are very young yet (and look healthy enough by the way).

 

I think the very low soil level in the pots isn't ideal either. A big pot is fine, but not filling it means a lot of wasted space, and less help for the plants themselves.
Also better to lift them out and put extra soil/compost in the bottom of the pot, rather than adding to the level already there, to avoid any problems.

Excessive feeding can mean more foliage growth at the expense of flowers/fruit too.

 

I use seaweed extract on mine 2-3 times during the growing season and they seem healthy enough. I also feed with an ericaceous feed once a month.
I use seaweed meal on other parts of the garden.
If you collect it, it will need a very thorough washing before use.

 

Thank you for the tips @Pete8