Blueberry leaves not looking green

Some of my blueberry plant leaves are not looking green. What if anything should I do ?

 

Most likely something to do with their environment that they're not happy about.
They appear to be planted in the ground - is that right?
Where abouts in the UK are you?

 

They are in a pot, i cant relocate them elsewhere im afraid

 

Have a look at this. This company produce more than 50% of blueberries found in UK and also import from Chile.
Growing Hall Hunter Blueberries - Hall Hunter

 

The burnt edges on many of the leaves is likely the result of something to do with the compost they're in.
Might they have been overfed? Too much feed would cause nutrient burn, which shows as burnt edges on leaves.

Mine have done well over the years in pots, so I can only say what I've done..
Ericaceous compost in the pots.
I only use rainwater on them as my tap water is very hard and usually water every day when it's sunny - they're in 22L pots.
They don't need much in the way of feed, so mine get one feed of Mircale-gro fertilizer for Azaleas per month during the growing season. Normal plant food won't work very well if you have ericaceous compost.
Mine are in full sun.

Are they all in a single pot? If so they may be overcrowded.
I have 1 plant per 22L pot - although mine are about 6-7 yrs old now.

 

hmm this is interesting as when i look online its suggesting maybe there is a nutrient deficiency so i was planning on increasing the feed. I feed them once a week with Mircale-gro fertilizer for Azaleas as i thought that is what the bottle says

 

It may be too much for them.
They only need minimal feed to thrive, so once a month is plenty.

Azaleas don't need weekly feeding either, so their instructions encourage you to feed more often than needed - more profit for them.

Mine are 9 yrs old now (just checked) and I've been using the method above since day one.
Each one is about 5ft high now and 3ft wide and I get many Kg of berries from July until end Sept.

PS the only reason that they may be deficient in some nutrients is if you're using an Azalea feed and hard tap water. Hard tap water would make some of the nutrients chelate (they would reform in tiny solid particles) and your plants would not be able to use it.
If your tap water is soft, or you have rainwater then you'll be fine.

 

why dont they make this clearer on the labels. I have been using filtered water from a water filter jug but i guess it could still be hard

 

It almost looks like scorch, but if you think it could possibly be a PH problem an iron feed wont do any harm to try.

 

That's likely the problem then.
Water filters don't alter the pH by anything significant so your plants may well be deficient in some nutrients.
If you can't use rainwater, you could consider using a pH adjuster for aquariums (so it's safe for plants too) often called pH Down. But you'd need to adjust the pH carefully with a pH meter or litmus strips.

 

Hmm I realised it wasn't adjusting the pH but I thought it was removing unnecessary minerals that the plant wouldn't want. I will look into this ph adjusters

 

A spoonful of vinegar in the watering can every now and then?
Cold tea if you can get it.

 

Another option is to use a reverse osmosis filter - that removes everything and leaves very soft water.
My waterbutts are empty so I'm using mine atm to refill one.
A few years ago I used RO water on my blueberries for about 3 months and they were fine.

It cost about £35 and is for domestic use.
The cartridges should be changed regularly if used for drinking water.
Mine is only for the blueberries and I've not changed the filter for about 4 years.

 

I give mine a folia’s feed with sequestered iron and it seems to help.

 

blueberries are mostly boggy scrappy plants that live in borderline barren soil. they shouldnt need much fert. The iron they need comes from dissolved mineral veins that are leaching into the water due to its acid content: the acid coming from decomposing peat or conifer leaves and the lack of minerals that would raise it back up to neutral.

If it is nutrient burn you could try flushing it with water several times. Try to collect the water if possible for your other plants doing this might increase the PH to neutral though. worth checking.