Canna Substra Flores (B) – 1 Liter

CANNA Substra Flores (B) is the bloom-phase component of the CANNA Substra two-part professional nutrient system, formulated specifically for plants grown in inert run-to-waste systems. The 1-liter bottle of the soft water (SW) B-part delivers the elevated potassium and phosphorus profile that flowering plants demand, along with a complete spectrum of trace elements in a directly absorbable form. Used alongside CANNA Substra Flores A, this nutrient solution supports dense, productive blooms from first flower through final maturation.

Canna Substra Flores (B) – 1 Liter Specifications

Key specifications for Canna Substra Flores (B) 1-liter bottle based on manufacturer documentation and product attributes.

Specification	Value
Brand	CANNA
Product Series	Substra Flores
Part	B (Part B of two-part system)
Water Type	Soft Water (SW)
Volume	1 Liter
Weight	1.9996 lb (~0.91 kg)
Growth Phase	Flowering / Bloom
System Type	Inert run-to-waste systems
Nutrient Profile	Elevated potassium and phosphorus; reduced nitrogen; direct-absorption trace elements
Supplier SKU	9211901

Why Choose Canna Substra Flores (B)

CANNA Substra Flores is a professional-grade two-part nutrient system designed to match the exact demands of the bloom phase in inert media. Here is what distinguishes the B-part and the broader Substra Flores system:

• Bloom-phase nutrient ratios: During flowering, plants require significantly less nitrogen than during vegetative growth, while their demand for potassium and phosphorus increases substantially. Substra Flores B is formulated to deliver that shift precisely, reducing excess nitrogen while providing the elevated P and K that support flower development.
• Directly absorbable trace elements: The formula includes trace elements in a form that plant roots can take up immediately, without requiring microbial conversion. In inert media where there is no soil biology to break down nutrients, this matters significantly for consistent uptake and plant response.
• Designed for run-to-waste systems: Unlike recirculating nutrients, Substra Flores is specifically calibrated for systems where nutrient solution passes through the medium once and drains away. The concentration and balance account for the fact that roots are not re-exposed to solution after the initial pass.
• Hard water and soft water versions: CANNA offers Substra Flores in two formulations — one for areas with naturally hard (high-mineral) tap water, and one (the SW version) for soft water. Choosing the correct version for your water source ensures the final nutrient solution reaches the intended mineral balance without over- or under-supplementing calcium and magnesium.
• Part of an integrated system: Substra Flores B works in conjunction with Substra Flores A. The two-part design keeps incompatible nutrients separated until they reach the reservoir, preventing precipitation and ensuring every element stays in solution and available to roots.

Best Uses for Canna Substra Flores (B)

Canna Substra Flores (B) is suited to specific cultivation setups and growth stages. Below are the primary scenarios where this product fits well.

• Run-to-waste hydroponic systems: This nutrient is developed for inert run-to-waste setups — systems where nutrient solution is delivered to the root zone once per cycle and excess drains away without returning to the reservoir. Examples include drip-to-waste on rockwool slabs or stonewool blocks, and NFT channels designed as once-through systems.
• Rockwool and stonewool growing: Substra Flores is particularly common in large-scale rockwool cultivation. Rockwool is an inert, sterile medium with no native nutrient content, meaning the grower controls the entire nutrient input through the solution. The professional-grade formulation of Substra Flores is designed for this level of precision.
• Flowering-phase nutrition in soft water regions: Growers in areas where tap water is naturally low in dissolved minerals (soft water) should use the SW version, which this product is. Adding a hard-water formula to soft water can result in excess calcium and magnesium relative to the target EC, throwing off the final balance.
• Commercial and semi-commercial production: Because Substra Flores is a complete professional nutrient — not a supplement — it can serve as the primary nutrient source during bloom without additional base nutrients. This simplicity suits both home grows aiming for precision and commercial operations that need consistent, reproducible results across many cycles.
• Transitioning from veg to flower: Growers who used CANNA Substra Veg A and B during the vegetative phase can switch directly to Substra Flores A and B at the start of flowering, keeping system management within the same product family and EC targeting framework.

Canna Substra Flores (B) vs Similar Bloom Nutrients

When choosing a bloom-phase nutrient for run-to-waste systems, several options exist across different product families. Here is how Substra Flores fits relative to other approaches:

Two-part vs single-part nutrients: Substra Flores uses a two-part A+B system to keep calcium-containing compounds separated from phosphate and sulfate compounds until they reach the reservoir. Single-part concentrates must either use chelated minerals or accept some degree of precipitation in the bottle over time. The two-part approach allows both A and B to be highly concentrated without interaction.

Run-to-waste vs recirculating formulations: Some nutrient lines are formulated primarily for recirculating systems (like NFT or DWC), where roots are continuously bathed in solution and plants can take what they need over time. Substra Flores is calibrated for single-pass delivery, where the solution must contain everything the plant needs in that one feeding event. Using recirculating nutrients in a run-to-waste system, or vice versa, can result in under- or over-feeding at the intended dose rate.

Soft water vs hard water versions: CANNA offers this product in both SW and HW versions. The SW version used here assumes that your source water contributes few dissolved minerals. If you are in a hard water region and unknowingly use the SW formula, your final nutrient solution will likely have excess calcium hardness beyond the intended range. Testing your tap water EC before selecting the correct version is recommended. Products like a quality carbohydrate supplement may also be added during bloom in run-to-waste systems, though these are separate from your base nutrient.

Compatibility

Canna Substra Flores (B) is designed to work within a specific set of growing conditions. Understanding compatibility helps avoid nutrient imbalances and system problems.

System compatibility: Substra Flores is developed exclusively for inert run-to-waste systems. This includes rockwool slab systems, stonewool blocks, and other inert media (such as clay pebbles in drip-to-waste configurations) where solution is delivered and drained without recirculation. It is not formulated for use in recirculating systems such as DWC, ebb and flow (flood and drain) with reservoir return, or recirculating NFT.

Grow medium compatibility: Best suited to chemically inert substrates — rockwool, stonewool, perlite, and similar materials that contribute no native nutrient load. Using Substra Flores in soil or coco (which has native cation exchange capacity) may result in nutrient lockout or imbalance, as the formula assumes an inert starting point.

Water source: The SW (soft water) version of this product is intended for use with water that has a naturally low EC (generally below 0.4 mS/cm from the tap). If your source water EC is higher, consider the CANNA Substra Flores HW version instead. Testing your water before selecting the correct variant is the most reliable approach.

Part A requirement: This is the B-part of a two-part system. It must be used together with CANNA Substra Flores A to provide a complete nutrient solution. Parts A and B should always be added to water separately — never mix them together as concentrates — to prevent nutrient precipitation. You can pair Substra Flores A and B with compatible CANNA additives such as CannaZym or Cannaflex during bloom, following CANNA’s schedule recommendations.

If you are also managing plant health and root development in your setup, products such as beneficial root inoculants or root support solutions are commonly used alongside base nutrients in professional run-to-waste grows.

Dosing Guidelines

CANNA Substra Flores B is a concentrated liquid nutrient intended for dilution before use. The following guidelines are derived from the canonical product documentation. Always refer to the current CANNA Substra feeding schedule for confirmed dose rates by growth week, as optimal EC and dose can vary with plant variety, ambient temperature, and system design.

General use protocol:

• Use CANNA Substra Flores A and B together in equal volumes. Add each part separately to your water — add Part A first, mix thoroughly, then add Part B. Never combine A and B concentrates directly.
• Standard dose rates for Substra Flores typically fall in the range of 25–40 mL per 10 liters of water (2.5–4 mL/L), adjusted depending on the plant’s growth stage within the bloom cycle. Confirm the current dose recommendation on CANNA’s published feeding chart for Substra Flores.
• Adjust the final solution EC based on plant variety and stage. Early bloom typically requires a lower EC than peak flowering. Run-to-waste systems generally target a slight positive drain (10–20% runoff) to prevent salt accumulation in the root zone.
• Maintain solution pH in the range of 5.5–6.2 for optimal nutrient availability in inert media. CANNA’s pH Perfect formulations are a different product line; with standard Substra, pH adjustment is the grower’s responsibility.
• Mix fresh nutrient solution for each irrigation event. Because this is a run-to-waste system, solution sitting in a reservoir for extended periods may shift pH; prepare only what you need for the day’s irrigation.

EC guidance: In inert run-to-waste systems, measuring both supply EC and drain EC helps identify whether the plant is consuming nutrients at the expected rate. If drain EC consistently exceeds supply EC, consider reducing dose or increasing irrigation frequency to flush accumulated salts.

How to Use Canna Substra Flores (B)

1. Confirm water type: Test your tap or RO water EC before mixing. If your source water EC is below approximately 0.4 mS/cm, the SW version (this product) is appropriate. Higher-EC water suggests using the HW version instead.
2. Prepare clean mixing water: Start with your measured volume of water in a clean reservoir or mixing tank. Use water at room temperature (approximately 20°C / 68°F) for best dissolution.
3. Add Part A first: Measure the recommended dose of CANNA Substra Flores A and add it to the water. Stir or agitate thoroughly until fully mixed.
4. Add Part B separately: Measure the same volume of Substra Flores B and add it to the water after Part A is fully dissolved. Stir again. Do not mix A and B concentrate together outside of the diluted water — this causes nutrient precipitation.
5. Add any supplemental products: If using CANNA additives (such as CannaZym or PK boosters), add these after A and B are mixed into the solution. Follow the current CANNA feeding schedule for additive timing and dose.
6. Check and adjust EC: Measure the final solution EC and compare to your target for the current growth week. Adjust by diluting with water (to lower EC) or adding more nutrient (to raise EC) as needed.
7. Check and adjust pH: Measure final pH and adjust to 5.5–6.2 using a pH-up or pH-down solution. Allow the solution to stabilize for a few minutes after each pH adjustment before re-measuring.
8. Irrigate as usual: Deliver solution to the root zone through your drip or feed system. Monitor drain EC and pH over the grow cycle to detect salt accumulation or pH drift early. Flush with plain pH-adjusted water if drain EC climbs significantly above supply EC.

Sources & Further Reading