Questions, answered.

Start with Veg A+B, then Bloom A+B, then Cake alone for the finish. Use our feed chart for the stage and our order calculator to estimate quantities for your garden. The calculator compares package combinations based on how much feed you plan to mix.

No. Use Veg A with Veg B, then Bloom A with Bloom B, then Cake alone. Follow the chart for the stage, amounts and transition. Keep concentrated A and B separate.

For photoperiod plants, we keep Veg A+B through flower day 21 for the nitrogen and calcium balance during early flower, then switch to Bloom A+B on day 22. Autoflowers follow plant development instead: switch when buds are about the size of your pinky nail.

Our Veg and Bloom formulas already use multiple sources of calcium as part of a complete feed. Separate Cal-Mag, silica and bloom boosters are not needed. Adding Cal-Mag changes the nutrient balance; correct a confirmed root-zone, delivery or environmental problem instead of adding a supplement.

Yes. The best foliar feed we have found is full-strength CropSalt straight from the reservoir, using the same finished nutrient mix and ratios as the root feed. In our use, the bleach and RunClean already diluted into that feed are safe to include at their normal reservoir rates. Do not add extra bleach or RunClean to the sprayer or use stock concentrate. A separate foliar fertilizer is unnecessary. We generally stop foliar spraying around day 12 of flower and spray after that only when there is a specific need.

Start with the highlighted Veg label rates: 3.07 g Veg A plus 2.07 g Veg B per US gallon. As roots develop and seedlings grow a couple sets of leaves, increase both parts together toward the full Veg rates of 4.6 g Veg A and 3.1 g Veg B per US gallon.

Open Grow guides for the soluble feed chart and guides specific to your growing system. The water-volume calculator below the guide library scales the soluble recipe for US gallons or litres. Concentrate users should follow the separate stock-tank and concentrate charts.

No. They are preweighed dry powders for preparing stock solutions. Add water to the stated final volume, prepare each stock separately and verify the delivered feed at the outlet.

No. Keep A and B concentrates in separate stock tanks and let each dilute into the irrigation water. For a hand-mixed batch, dissolve A in the water first, then add and dissolve B. Check the finished feed at delivery.

Measure the fully mixed feed after the inputs have dissolved. In an irrigation system, check the solution at a running outlet. Compare pH and EC together.

Meters may convert the same EC reading to PPM using different scales. For example, 2.3 EC reads 1,150 ppm on the 500 scale and 1,610 ppm on the 700 scale. Compare EC directly when possible; if you report PPM, include your meter’s scale.

You can temporarily replace a missing part with the corresponding part from the other stage: Veg A can replace Bloom A, Bloom A can replace Veg A, Veg B can replace Bloom B, and Bloom B can replace Veg B. Keep using both an A and a B part.

You can also use a complete pair while waiting for your replacement. At full chart strength, the Veg pair is 4.6 g Veg A + 3.1 g Veg B per US gallon, and the Bloom pair is 5.1 g Bloom A + 2.6 g Bloom B per US gallon. These rates apply to the complete pairs.

Return to your scheduled nutrients when the replacement arrives. These temporary Veg/Bloom substitutions apply before the Cake finishing stage.

After a normal nutrient feed, collect the last 10% of runoff from a freely draining, top-fed pot. Compare feed and runoff pH and EC, using the same ppm scale if applicable. Keep samples from different pots separate. DWC and bottom-fed systems use reservoir and system measurements instead.

No. In our usual coco example, feed at pH 6.2 and last runoff around 6.0–6.1 can be normal when the crop is healthy and readings are stable. Look at the trend, EC, plant condition and irrigation before choosing a correction.

For confirmed buildup in freely draining, top-fed coco, rockwool, peat and similar media, flush thoroughly with suitable tap water adjusted to pH 6.4. Resume normal nutrients 24 hours later and retest after two normal feeds. If pH remains low from buildup, reduce the complete A+B strength and increase runoff. This is not the correction for a DWC reservoir or bottom-fed tray.

Not automatically. First compare feed and runoff pH/EC and identify the cause. When the readings and setup confirm underfeeding, we increase both A+B parts together and allow more dryback to build a modest nutrient reserve, then monitor and adjust as pH recovers. Fresh-rockwool alkalinity or already excessive EC needs a different response.

Some nutrient reserve in the medium is normal, so runoff EC does not have to equal feed EC. We do not deliberately stack EC with CropSalt; it can crash root-zone pH. Read pH and EC together and check that complete irrigations wet the whole pot and produce enough runoff. Correct buildup if it is causing low pH or plant stress.

No extra Cal-Mag is needed. Our Veg and Bloom formulas supply multiple sources of calcium. Check the complete recipe, root-zone pH and EC, and water delivery. A root-zone problem can resemble a calcium shortage; adding Cal-Mag does not fix that cause.

Compare that pot’s outlet flow, wetting and runoff pH/EC with a healthy neighbor. Repair an isolated emitter fault locally. If low-pH buildup appears in scattered pots and you are not testing every root zone, we correct the room rather than assuming the untested pots are clear.

Use the stage-appropriate nutrient feed for normal coco irrigations. A plain-water irrigation about once a week may be used to help prevent buildup. A corrective flush addresses a measured root-zone problem and is separate from that preventive water day.

Use plant size, actual substrate volume, pot weight, root development and environmental demand to set the interval. Wet the whole root zone, check drainage and adjust as demand changes. A fixed clock schedule does not fit every garden.

No. For soluble feeding in soil or peat, our general pattern is two nutrient irrigations followed by one plain-water irrigation. Account for the medium’s existing fertilizer and water holding before adding more feed, especially in heavily amended soil.

For an ordinary preplant soak, use full-strength nutrient solution and RunClean to adjust it to pH 5.5. If you are using a recirculating soak, use pH 6.0 instead and keep adjusting back to 6.0 until it stops rising. These are two preparation methods for new, unplanted rockwool—not corrections for an established crop.

Measure actual substrate volume. Before planting, use 50 g per gallon of substrate for pots below 10 gallons (60 g in 1-gallon pots), 40 g per gallon for pots from 10 through 20 gallons inclusive, and 30 g per gallon for pots above 20 gallons. Distribute evenly. Topdressing, subdressing and reapplication are separate decisions; do not apply another full incorporation dose to a planted pot by default.

No. Solubles deliver the stage-appropriate Veg or Bloom pair through the reservoir. Granular is incorporated into the medium, with water in the reservoir during main growth until the Cake finish. Do not add daily A+B to Granular by default or copy sterile-soluble practices into its microbial program.

For plants receiving full-strength soluble Veg or Bloom feed, let the reservoir empty, run pH-adjusted plain water for 36 hours, then mix the next nutrient batch. Skip the interval while seedlings are below full chart strength, when switching to Cake, and between Cake batches. Granular uses water in the reservoir during main growth and does not follow this soluble between-batch routine.

For photoperiod plants fed solubles, use Cake alone in week eight of an eight-week cycle, weeks eight and nine of a nine-week cycle, or the final two and a half weeks of longer cycles. Continue Bloom until Cake starts. Our autoflower and Granular + Cake guides use the final two weeks. Follow the chart for your program. Cake mixes at 3 g per US gallon.

No. Cake replaces Bloom A+B during the finish; it is not added on top of them. Mix a fresh batch of Cake alone and continue it through harvest.

In top-fed, drainable media, we strongly recommend a plain-water root-zone flush on the day Cake starts, followed immediately by Cake. In AutoPots and other wicking systems, switch directly to Cake. No top-water flush or 36-hour water interval is needed at the switch or between Cake batches.

No. A water-only finish changes what is available at the roots; it does not wash absorbed minerals out of the flowers. The leaf fade comes from nutrient withdrawal and senescence, not the flowers being rinsed clean.

We see no benefit from continuing to feed calcium during final senescence, regardless of the nutrient line used. Our finishing comparisons showed no difference in flower calcium with or without added calcium. When using Cake, feed it alone without calcium or Cal-Mag.

RunClean removes mineral scale and can be used in place of pH down. It is not a sanitizer and does not replace treatment for biological growth. Identify the type of buildup before choosing a cleaning method.

When adjusting pH, add measured amounts, mix and test the finished feed. If pH down is not needed, we recommend 0.2 mL per US gallon for scale prevention, followed by a final pH check. Equipment soaks and existing buildup have separate product directions. Never premix concentrated RunClean with bleach or pH up.

Tap, RO, or a blend can work. We like enough tap in the blend to reduce or eliminate the need for pH up. Keep the nutrient ratios the same; source-water minerals are not a substitute for one of the parts.

VPD depends on the conditions at the leaf as well as air temperature and humidity. Use measured leaf temperature with canopy air temperature and RH in the CropSalt VPD calculator, and interpret the result with the crop stage and irrigation response.

Yes. Our LED grow chart uses moderate lighting levels and is not intended to be extreme. Supplemental CO₂ can help, but it is optional. Follow the same feed and lighting chart and disregard the CO₂ setting if you are not supplementing.

We use MICROBE-LIFT BMC. For prevention, use 0.1 mL OR 1–2 drops per US gallon. Light and heavy infestations have separate root-drench rates in the article. Do not use BMC with bleach, HOCl or another sterilizer.

We use CareFree Enzymes Pond & Fountain Protector at 1 mL per 20 US gallons for gradual breakdown or 5 mL per 20 US gallons for faster breakdown. These are the rates we use in our gardens. Keep the enzyme treatment separate from bleach, HOCl and other sterilizers. In our experience, biofilm-compromised black aquarium pumps and air stones need replacing.

We ship to the United States and Canada. Available products and sizes depend on your delivery destination. Choose Canada before shopping to see available options. Shipping and taxes are calculated at Shopify checkout.

For commercial orders, request a quote with your products, quantities and delivery details.

All sales are final. We do not offer returns, refunds or exchanges. Contact us with your order number if you have a question about an order.

Yes. On the commercial inquiry page, choose an order quote or program help. For a quote, include products, quantities, destination postal code and delivery access. For program help, describe your medium, irrigation or mixing method and what you want help planning. Commercial pricing is handled directly by our team.

Tell us your growing medium, irrigation system, crop stage, complete feed recipe and what changed. Include feed pH/EC and clear photos. For top-fed pots, also send the last 10% of runoff after a normal nutrient feed. For AutoPots, other wicking systems or DWC, send the relevant reservoir and base or root-zone solution readings instead.