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Yellow photinea

My photinea hedge comprises of about 20 plants, half of which I think are yellowish on the leaves. The rest look very healthy and are growing much faster. i think they may be different varieties? The yellow ones are also on a cement retaining wall agaInst a Stratco fence , may get too hot ??? I water often via drillers sometimes twice a day when hot . Please help do they need iron 

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  • Paul B3Paul B3 Posts: 2,808

    I'm not sure what a Stratco fence is quite honestly ; possibly the yellowing plants are feeling the affects of too high a pH level (maybe leaching from the cement) . This results in chlorosis (yellowing) of the leaves .

    I always swear by (not at image) a product called Sequestrene ; I think it's still available . Readily remedies similar problems on other lime-haters like Camellias and Rhododendrons etc .

  • Paul B3Paul B3 Posts: 2,808

    Just Googled Stratco ; are you in Australia by any chance ?image

    Havn't seen much of that in the UK .

  • Yes in Australia 

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