Grow More sells fourteen water-soluble powders. A pepper crop needs three of them at most: a balanced feed for seedlings, a nitrogen-forward feed for vegetative growth, and a potassium-forward feed from first flower through ripening. The company's own label rate for the 20-20-20 is one tablespoon per gallon of water. Everything past that is timing, and timing beats product choice every time.

What Grow More actually sells

Fourteen analyses make up the water-soluble line. They are 20-20-20, 15-15-15, 21-7-7, 6-30-30, 5-10-30, 12-26-26, 0-50-30, 30-10-10, 10-52-10, 15-10-30, 20-10-20, 20-6-16, 15-30-15 and 0-37-37. A liquid Seaweed Extract at 0.10-0-0.44, made from Ascophyllum nodosum, sits alongside them. Two analyses that circulate in pepper forums, 10-55-10 and 5-10-40, are not in that catalogue. The nearest real products are 10-52-10 and 5-10-30. Check the bag before you buy to a number someone quoted you.

ProductEmphasisStageNotes
20-20-20BalancedSeedling and transplantLabel rate: 1 tablespoon per gallon.
15-15-15Balanced, lower salt loadSeedling and transplantAlternative to the 20-20-20.
30-10-10High nitrogenEarly vegetativeLabel: 3 lb per 100 gal periodic, 8 oz per 100 gal constant feed.
21-7-7High nitrogen, acidifyingVegetative on alkaline waterUseful where irrigation water runs hard.
15-30-15High phosphorusPre-bloomGentler than the 10-52-10.
10-52-10Very high phosphorusFlower initiationShort window only. Not a season-long feed.
0-50-30Phosphorus and potassium, no nitrogenFloweringPair with a nitrogen source or growth stalls.
6-30-30High phosphorus and potassiumPeak flower to early fruit setCarries enough nitrogen to hold the canopy.
5-10-30High potassiumFruit fill and ripeningThe workhorse from first set onward.
15-10-30High potassium with nitrogenFruit fill on a long cropBetter than 5-10-30 when leaves pale.
0-37-37Phosphorus and potassium onlyLate fruit, finishingStops vegetative push before a cold finish.
20-10-20General greenhouse ratioWhole crop, single-product programsCommon choice where one tank feeds everything.
Seaweed Extract 0.10-0-0.44Kelp, trace elementsAny stageA supplement, not a feed. Nutrient content is negligible.

Which formula should I use at flowering?

Switch off high nitrogen when the plant starts branching and setting buds, and move to a phosphorus-forward product such as 15-30-15 or 10-52-10 for a short window. At fruit set, change again to a potassium-forward feed: 6-30-30 through early set, then 5-10-30 or 15-10-30 through ripening. If the leaves go pale under a 0-50-30 or an 0-37-37, that is the missing nitrogen talking, and the fix is a product that carries some. The switch from high nitrogen to high potassium at first flower is the biggest single lever in a pepper feed program, and most growers make it too late.

Mixing and dilution

Dissolve powders fully before the solution reaches a plant, because an undissolved crystal in a drip line becomes a blockage or a burn. Grow More publishes a one tablespoon per gallon general rate for the 20-20-20 and a two-tier commercial rate for the 30-10-10. The rest of the line carries its own label directions, so read the bag rather than reusing a number from a different analysis. Seedlings take a quarter to a half of full strength. For foliar work, halve the rate again and spray at dawn or dusk, when the leaf stays wet long enough for uptake.

Target pH 5.8 to 6.3 in a hydroponic or substrate feed and 6.0 to 6.8 in soil. Flush containers with plain water every three to four weeks. Salts accumulate quietly and cut uptake long before any symptom shows on a leaf.

Can I mix calcium nitrate into the same tank?

No. Calcium meets phosphate and forms calcium phosphate; calcium meets sulfate and forms calcium sulfate, which is gypsum. Both fall out of solution, clog emitters and deliver nothing. The standard answer is a two-tank stock system: calcium nitrate alone in tank A, phosphates and sulfates in tank B, each mixed at 100 to 200 times working strength. Equal portions of the two go into a large volume of fresh water, where the concentrations stay low enough that nothing precipitates. This applies to any brand, Grow More included.

Does calcium nitrate prevent blossom end rot?

Usually not. UF/IFAS's bulletin on blossom-end rot in bell pepper describes a calcium delivery problem rather than a soil shortage. Calcium travels to fruit in the transpiration stream and does not move again once a cell has used it. A plant under water stress at night fails to deliver enough of it to the blossom end at the moment the fruit needs it. Soil and water testing tells you whether calcium is short. If it is not, more calcium fertilizer changes nothing and even-moisture irrigation does. Foliar calcium sprays face the same problem: sprayed calcium stays in the leaf it lands on. See fruiting problems for the rest of the symptom list.

What Grow More does not sell for this

Calcium nitrate, magnesium sulfate and 6 percent iron chelate are generic inputs that many suppliers carry. Grow More's own catalogue puts its iron into products such as Bio-Cozyme, a 10 percent iron EDTA chelate with a biostimulant package. Buy the commodity salts wherever they are cheapest, and use them on evidence: correct magnesium when interveinal yellowing appears on older leaves, correct iron when it appears on new growth. Guessing at micronutrients causes more trouble than it fixes, as the nutrient lockout guide lays out.

By growing style

In containers, feed weaker and more often, and flush every two weeks. Under glass, monitor EC, pre-dissolve powders and mix in batches rather than dosing by eye. In field beds, water deeply after feeding so the nutrients reach the root zone instead of sitting on the surface, and keep organic matter going in alongside the synthetic feed. A California Wonder in a bed and a Habanero in a ten-gallon pot want the same ratios on different schedules. For dilution arithmetic, see dosing and diluting fertilizer.

Sources & Further Reading