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Powder for leaf yellowing
Lyn Plant-Wells
Posts: 338
I acquired some blackish, coarse powder whilst in France (see pics) called Anti-Chlorose Kelatene, which I think might help to remedy the yellowing leaves on my young Hibiscus plants. These are in a raised bed which gets very dry (constructed for previous house owners) in my south facing garden on the IoW. I photographed the instructions from the packet (I have a small amount in a tub) but cannot see the powder/water ratio. 
Does anyone have any ideas?
The Hibiscus has rather pale foliage and some leaves go yellow and drop. They are presently producing their first flowers. They were also brought from France. (‘Pups’ taken from a tall Hibiscus screen.)
I seem to spend my life watering the raised beds - I intend to do away with one as it is choked with Agapanthus and the outer
walls are cracking.
walls are cracking.Photos of packet to follow.
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Posts
Generally speaking, cholorosis, or leaf yellowing, occurs in plants which are not taking up enough iron and/or magnesium and that usually happens when you have ericiaceous plants such as rhodos, azaleas, camellias, skimmias growing in soil which is neutral to alkaline or being watered with hard tap water. You can correct the iron deficiency with products from the GC or DIY shop which contain sequestered or chelated iron for ericaceous plants.
However, you say hibiscus plants are the problem so I reckon the problem is general nutrient deficiency and thirst. Give them a very good soaking - 10 litres per plant poured slowly and repeated daily for at least a week and then every 2 or 3 days till autumn rains set in. After the first week you could add some dilute tomato feed to the water but just once. Next spring, give the entire raised bed a generous dollop of pelleted chicken manure and a mulch of well-rotted manure while the soil is still moist after winter.
The doses indicated for your French product depend on the plant being treated and the severity of the problem; the four rows refer to vegetables and herbaceous plants then roses, hydrangeas, vines and shrubs, pear and apple trees and lastly plums and peaches.
The instructions say to use it, in diluted form, on chalky or alkaline soils at time of planting or as a corrective if problems develop.