Orchid Fertilizer - Feed ME! MSU - RO/Rain/Tap Water

The Verdict

The Fertilizer That Actually Respects Your Water Source

Most orchid fertilizers treat water like it’s irrelevant. It’s not. The pH of your tap water, the mineral content, whether you’re using reverse osmosis — all of it changes what your orchids can absorb. That’s exactly why Feed ME! MSU has earned a loyal following among serious growers. This isn’t a one-size-fits-all pellet; it’s a fertilizer that acknowledges the reality of how you water.

What You’re Actually Getting

The 8-ounce container is a white screw-top jar with a simple label — no marketing theater. Inside is a fine, pale powder that dissolves completely in water with minimal stirring. The “MSU” in the name references the Michigan State University orchid fertilizer formula, which was developed specifically for orchids grown under typical greenhouse conditions.

The critical difference here is the water-source specificity. The RO/Rain version includes chelated calcium and magnesium — the tap water version doesn’t, because tap water usually already contains those minerals. If you’re using RO or rain water and feeding a standard fertilizer without calcium, you’re setting up your orchids for weak growth and blossom end rot. That’s a problem this product solves outright.

How It Performs in Practice

The mix ratio is a straightforward 1 teaspoon per gallon. That’s a gentle 125 ppm nitrogen, which is ideal for weekly “weakly, weekly” feeding. I’ve used this on Phalaenopsis, Cattleyas, and a stubborn Den phal that hadn’t bloomed in two years — it pushed new roots within three weeks.

The nitrogen source matters here. It’s split between ammoniacal and nitrate nitrogen, skipping urea entirely. For orchids grown in bark — which doesn’t harbor the microbes needed to break down urea — that means the fertilizer is available immediately. You’re not waiting for the media to “wake up.” This is one of those technical details that separates a well-designed formula from a generic one.

What 225 Buyers Are Saying

The 4.5-star average is earned. A recurring theme in reviews is how forgiving this formula is. One buyer noted, “I’ve killed orchids with fertilizer before. This one I can’t seem to overdo — I accidentally double-dosed one week and saw zero burn.” Another grower who keeps over 60 orchids described it as “the only fertilizer I’ve found that doesn’t leave white crust on my bark media.”

That last point deserves attention. Salt buildup is a silent killer of potted orchids, and several reviewers specifically mentioned cleaner media after switching to Feed ME!.

Where It Falls Short

The honest downsides:

• Value per gallon: The 8-ounce jar makes about 48 gallons. If you’re feeding a large collection weekly, you’ll go through this in a couple of months. The price-per-use is reasonable, but the smaller size is a hassle for serious growers.
• Not a miracle cure: If your orchids are already healthy on a balanced 20-20-20, you won’t see dramatic changes. This is a refinement, not a revolution.
• No measuring scoop included — you’ll need your own teaspoon. Minor, but annoying on the first use.

Who Should Buy This

Buy it if: You use RO or rain water, you grow in bark (especially if you’ve seen yellowing leaves that suggest calcium deficiency), or you want a precise, urea-free formula that’s hard to mess up.

Skip it if: You have a tiny collection, you’re happy with whatever generic fertilizer you’re using, or your tap water is already mineral-rich and you’re not seeing problems.

FAQ

Q: Does this work for all orchid types? A: Yes. It’s balanced for epiphytic orchids grown in bark — Phalaenopsis, Cattleya, Dendrobium, Oncidium. For terrestrials like Paphiopedilum, dilute to half-strength.

Q: Can I use it every time I water? A: For most growers, yes — at 1 tsp/gallon weekly. If your orchids are in a very airy mix, you can even go twice a week at half-strength. Just flush with plain water monthly to clear salts.

Q: Is the RO/Rain version safe for tap water? A: You can use it with tap, but you’ll be adding calcium and magnesium your water may already have. The tap version is better matched — that’s the whole point of the lineup.

The Verdict

Rating: 4.6/5

Feed ME! MSU is the fertilizer you buy when you’ve graduated from “my orchid is still alive” to “I want it to actually thrive.” The water-source-specific formulas show a level of thought most competitors skip entirely. It’s not the cheapest option, and the small container will have you reordering sooner than you’d like, but for growers using RO or rain water, this is the closest thing to a sure bet in orchid nutrition.

Buy it if you’re serious about your orchids and want a formula that respects your watering setup. Skip it if you’re casual, on a tight budget, or your current fertilizer is already working without issues.

Where to Buy

👉 Check Price on Amazon →

We earn a small commission at no extra cost to you — this helps fund more honest reviews.

Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.