Magnesium Deficiency

Interveinal chlorosis - yellowing between veins while the veins themselves stay green - starting on older / lower leaves. Magnesium is mobile so the plant strips it from older leaves to feed new growth. Common in coco and hydro on RO or soft tap water without cal-mag.

What usually causes it

• pH out of optimal range (Mg uptake best at 6.0-7.0 in soil, 5.8-6.3 in coco/hydro)
• Soft / RO / rainwater with no cal-mag supplementation
• High K or high Ca antagonising Mg uptake (cation competition)
• Cold root zone slowing transport

Related product categories

• CalMag & Minerals

Terms worth knowing

• pH

Walk the questions if you are not sure this is the match. The notes above are the same ones the tool ends on.