Down To Earth All Natural Fertilizers Bat Guano 7-3-1 Box Or
✅ PROS
- Prilled granules disperse evenly and dissolve without clumping in a watering can
- Smell is mild and earthy — won't offend neighbors or linger indoors
- OMRI-listed for organic gardening; safe for edible crops when applied per label
❌ CONS
- Nitrogen content (7%) is too low for heavy vegetative growth — this is a bloom-phase fertilizer, not an all-purpose one
- Box packaging can tear at corners during shipping; transfer to an airtight container immediately
- Powder dust during mixing can irritate lungs — wear a mask when handling
The Verdict
Let me be blunt: bat guano is one of those fertilizers that sounds like a gimmick until you actually use it. I’ve tested dozens of organic amendments over the years, and Down To Earth’s 7-3-1 formulation is the real deal for one specific job—getting plants to flower and fruit. Here’s the honest breakdown.
What’s in the box
You get a 5-pound box of prilled granules (small, uniform pellets that look like dark coffee grounds). As shown in the product image, the box is straightforward and utilitarian—no fancy marketing, just the NPK ratio and OMRI organic seal plastered on the front. The granules are dry, not sticky, and they pour cleanly. No measuring scoop is included, so grab a tablespoon from your kitchen drawer.
The real-world performance
This is where Down To Earth separates itself from cheap guano products. The prilled format means you don’t get the dusty, clumping mess that plagues powdered guano. It dissolves readily in water for liquid feeding or works as a top-dress for slow-release. I used it on tomatoes, peppers, and a container fig tree. Within three weeks, flower set noticeably increased on the tomatoes, and the peppers stopped dropping blossoms in the heat.
The 7-3-1 ratio is the story here. The nitrogen is moderate, but the phosphorus (3%) and the trace micronutrients from the bat guano source drive root development and bloom production. It’s not a complete fertilizer—you’ll still need a balanced feed during vegetative growth. But as a targeted bloom booster, it performs.
What buyers consistently praise
The 4.7-star average across 235 ratings holds up. One top reviewer noted, “My orchids have never bloomed this consistently. I dissolve a teaspoon in a gallon of water every two weeks during the growing season.” Another gardener with raised beds said, “This out-performed the expensive liquid bloom formulas I was using. One box lasted me two full seasons.” The smell comes up repeatedly as a pleasant surprise—it’s earthy, not barnyard-strong, which matters if you’re mixing it in your kitchen or garage.
Where it falls short
Honest drawbacks, because they exist. First, the nitrogen is too low for leafy greens or lawns—this is a specialist tool, not a generalist. Second, the box packaging is not resealable, and I’ve seen two complaints about corners splitting in transit. Transfer it to a mason jar or plastic bucket immediately. Third, the fine dust that kicks up when you measure it is irritating. Wear a dust mask, especially if you have respiratory sensitivities.
Who should buy this
- Container gardeners growing flowering ornamentals, tomatoes, or peppers—you’ll see the difference in bloom count.
- Organic gardeners who need an OMRI-listed phosphorus boost without synthetic salts.
- Orchid and houseplant enthusiasts who want a gentle, slow-release feed that won’t burn roots.
Skip it if you’re growing leafy greens, maintaining a lawn, or want a single all-purpose fertilizer to handle everything.
Frequently asked questions
How often should I apply this? For liquid feeding, mix 1 tablespoon per gallon of water and apply every 2–3 weeks during the growing season. As a top-dress, work 2–3 tablespoons into the top inch of soil around the drip line once a month.
Is it safe for edible plants? Yes, it’s OMRI-listed for organic production. Just follow the label rates and avoid applying within 2 weeks of harvest to let the nutrients fully break down.
Does it expire or lose potency? Unopened, it keeps indefinitely in a cool, dry place. Once opened, moisture will cause it to clump, but it won’t spoil. Just break up clumps before use.
The Verdict
Buy it if you want a reliable, organic bloom booster for flowering plants, tomatoes, or container gardens. Skip it if you need a balanced all-purpose fertilizer or have a sensitive respiratory system.
Rating: 4.6/5 — It earns its keep in the flowering phase, with minor packaging and dust issues keeping it from a perfect score.
Where to Buy
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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.