Fresh, consistent, and from one supplier with quality control we have relied on for years. We test them at Logan Labs so we know the chemistry integrates cleanly into a soil mix: high in calcium, low in chlorides and bicarbonates, plenty of nutrients without upsetting your balance. The biology is part of all good worm castings. The consistency is the hard part, and that is what we deliver.
★★★★★ 4.9 (556 reviews)• Tested at Logan Labs
The trouble with most castings
Not all worm castings play nice in a recipe.
Castings are one of the most inconsistent inputs on the market. Two bags from the same brand can perform nothing alike, and the chemistry you cannot see is what quietly throws off a soil mix you worked hard to dial in. Here is what you are up against.
Inconsistent batch to batch
When every bag is different, you cannot build a repeatable recipe on top of it.
Hidden salts
High chlorides and bicarbonates can push your soil out of balance before you notice.
No analysis
Most brands never publish numbers, so you are trusting a label with nothing behind it.
Why growers trust ours
Fresh, consistent, and tested for your recipe.
We grow too, so we hold our castings to the standard we want in our own pots. We know the chemistry because we run it at Logan Labs, and we know the quality because it comes from one supplier we trust batch after batch.
Tested at Logan Labs
We check the chemistry that matters for mixing into soil, so you know exactly how these behave in a recipe.
High calcium, low chlorides and bicarbonates
Plenty of nutrients without the hidden salts that push a balanced soil mix off track.
Fresh and consistent
From one supplier with quality control we rely on, so every bag performs like the last.
Well screened and ready
Clean, black, and moist. Mixes into soil or brews into tea without the mess.
Do not take our word for it. See the Logan Labs analysis on these exact castings.
