Magnesium?
14 years ago
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Elemental Magnesium
Comments (31)Brad - if you thought what I said was, adding Mg is = to snake oil and will ruin soils in the long run, you don't really understand what I was trying to convey. Simply put, thinking that increasing the amount of Mg your plant is getting based on the assumption that more Mg is necessarily better, is far more likely to end in loss of potential rather than gain. Increasing the level of Mg to eliminate a known Mg deficiency is about the only scenario I can think of other than increasing the Mg supply beyond what would normally be reasonable to fix one of those unusual situations where an excess of Ca is blocking uptake of Mg. In addition, the color of hydrangea blooms is an entirely different topic and much more complicated than the discussion about adding Mg to soils in willy nilly fashion. From something I wrote a few years back on another thread: "Three different pigments - chlorophyll, flavonoids, and carotenoids - mixed in different proportions, give color to plants. By mixing and matching the three pigments, an endless variety of colors can be created. E.g. most reds are the result of mixing orange carotenoids with magenta flavonoids. Cellular pH (not to be confused with soil pH) has a profound effect on plant color. Even most experienced gardeners think that lowering soil pH produces blue blooms in hydrangea. Technically, it is only a part of the equation. Lowering soil pH makes aluminum ions more available for plant uptake. The aluminum is then available to bond with pigment compounds (anthocyanin, the colored component of flavonoids) changing the way color is reflected. Our perception is blooms changing from pink to blue. The anthocyanidin group is what makes apples, autumn leaves, roses, strawberries, and cranberries red. They make blueberries, cornflowers, and violets blue. They also make some grapes, blackberries, and red cabbage purple. One of the things that changes the color of anthocyanins is the level of acid or alkali (the pH) in the cell surrounding the pigment. As cellular pH increases, the pigment changes structure and reflects different wavelengths of light. The anthocyanin reflects bright pink in acid cell environments, reddish-purple in neutral and green in more alkaline cells. When I write things it's never from the perspective of one size fits all; and when I disagree, it's usually because I see someone offering a 'one size fits none' perspective that has the potential to diminish someone else's growing experience, either because it's simply wrong or not qualified to the degree it can simply be overlooked. Al...See MoreIs This a Magnesium Deficiency on my Rhododendron Leaf?
Comments (9)Try using Miracle Gro for Acid Loving Plants and see what happens. This has extra iron included in the formulation and works almost like a tonic to "green up" virtually any broadleaved evergreen plants....very fast acting, you should see color improvement in a week or two. btw, iron chlorosis will be far more likely to be the problem with acid lovers than would be an Mg deficiency. FWIW, I would always recommend using a fertilizer formulated specifically for rhododendrons or other acid loving plants when growing these in containers. Regular ferts simply do not contain the right nutes in the right concentrations otherwise....See MoreIs it iron or magnesium defeciency !?
Comments (13)Thanks, Silica! The tree arrived in this condition. It is now receiving the same soil mix, fert, and care my other trees are receiving. I’m hoping the issue will correct itself with in time and new leaves, but I’m wondering if I need to add chelated iron since it is already behind the curve....See MoreCompost old magnesium supplement tablets?
Comments (0)Dextrose, cellulose, and cornstarch are carbohydrates. Silicon dioxide is essentially sand. Magnesium Stearate is a salt of Magnesium (a plant nutrient) and fatty acid. Everything above is harmless to plants. I would blend the tablets and mix them with compost....See More- 14 years ago
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