Peters Excel 15-5-15 Cal-Mag Special w/Black Iron (1) 1 1lb. Bag.

Magic sauce for seedlings! So safe it can be used on any plants and seems to benefit everything I've used it on (salvias, pansy, villas, marigolds, snapdragons, begonia, geranium, etc al)! I am loyal to this brand! They have excellent product support also. You can ask their experts any question and they will answer. Love this stuff!

Never had all 10 of my ladies over 10’! This stuff is a must have for marijuana!!!

perfect for my vandas

This fertilizer is rather difficult to find, but it's worth the hunt. Many of the speakers we've had come to our orchid society have recommended this fertilizer, which was first promoted by Michigan State University. The calcium and magnesium supplements appear necessary for proper orchid development. We use it one-fourth to one-half recommended strengty monthly during the growing season.

My orchids look wonderful with lots of blooms. I use both the Peter’s fertilizers

I have been watering my plants with reverse osmosis water and a different fertilizer for many years. Before using this, I had started having issues with a few cattleyas producing new growth that promptly turned black. I believed it to be a nutrient deficiency, and was right. After using this fertilizer, they are now producing new, healthy growth! I will continue to purchase this product!

Using this on my orchids and I found that the ph levels dropped dramatically. I started out with 7 ph using ro water added the fertilizer at 1/4 tsp for a gallon and the level dropped to 4.5. Don't want to correct using other chemicals like ph up, too much of a hassle. I can't say how this will work with your tap water but please check your ph.

Orchid growers always recommend 15-5-15 fertilizer 3 - 4 times/year from March thru Sept. Following the instructions will produce healthy growth.