Sooby,
I have used human iron pills crushed in water on two different plantings. One is a rugosa rose that is near a roof valley where the water comes off the roof heavily. I think the soil gets nutrients washed away. The other are Oriental poppies that sometimes come up in the spring looking very yellow with iron deficiency. I have crushed the pills, and put them in a watering can and watered all around the plant. This has greened them up. If I remember correctly, I believe the dosage used was one pill crushed and put in a 2 gallon watering can of water. Would it be better to water directly over the foliage?
