Maxicrop PPSI61L Sequestered Iron, 1L - Iron Infused Natural Seaweed Extract - Protects Against Yellowing - Supports Growth In Difficult Soil Conditions - Plant Nutrition, Blue

This is what you need to revive ericaceous plants that have yellowing leaves, such as camellias or rhododendrons that have been in soil that is too alkaline. Easy to apply by diluting and pouring over the root area. You might have to reapply if the soil remains alkaline but it does help the plant's deficiencies.

Excellent furtiliser

Good product. Not used it long enough yet to give it 5stars

Good value from amazon on price, arrived quickly. little goes a long way. I've been using it over the summer and plant's seem healthy

Very effective, use for all ericaceous applications. Maxicrop seaweed is my go to for ANY plant problem.

Like this as having no nasties and compatible with organic gardening. Unfortunately, it doesn’t appear to be helping with the yellow leaves my plants have now. Think that’s due to the rubbish compost that’s the only option to buy now, for organic growers; which is basically wood fibre and plants don’t like it. Will keep using, along with my home-brewed comfrey feed, as plants need something in our difficult climate we humans have managed to produce!

Been using this for yonks. First discovered it when we moved to a house where the garden soil was alkaline. It was in the days when you could literally buy bails of peat, and potting compost was mostly peat based. Aye, them were t'days. Anyhoo, no matter how much peat we dug in, azaleas, rhododendrons, gardenias and hydrangeas etc all struggled, leaves yellowed and dropped. Then we started watering with this elixir, and all was well. It boosts growth and root development, has that comfy potting shed aroma, seems to last well between waterings and, appearance wise, it's black so isn't likely to be drunk...unless you're a Guinness or Dandelion and Burdock fan. The 1L size lasts for ages, so it's value for money imo.

Very good quality product does what it says on the tin