FoxFarm Tiger Bloom – 2.5 Gallon

FoxFarm Tiger Bloom® is a phosphorus fertilizer containing nitrogen, formulated specifically for the flowering and fruiting stage of plant growth. Available in a 2.5-gallon container, it is designed to encourage abundant fruit, flower, and multiple bud development. The low-pH formulation keeps micronutrients available throughout storage and is compatible with both hydroponic systems and soil-based grows.

FoxFarm Tiger Bloom 2.5 Gallon Specifications

The table below summarizes the key specifications for FoxFarm Tiger Bloom 2.5 Gallon as derived from the product’s confirmed attributes and manufacturer description.

Specification	Value
Brand	FoxFarm (distributed by Sunlight Supply)
Product Type	Phosphorus fertilizer with nitrogen
Container Size	2.5 Gallon (9.46 L) liquid concentrate
Weight	25 lb (approx.)
pH Formulation	Low pH (maintains micronutrient stability in storage)
Dose Rate	2–3 teaspoons per gallon of water
Use Stage	First signs of flowering through harvest
Application Methods	Root drench (soil or hydro reservoir) or foliar spray
Compatible Growing Media	Hydroponics and soil

Why Choose FoxFarm Tiger Bloom 2.5 Gallon

FoxFarm Tiger Bloom is a well-established liquid bloom fertilizer used by both hobbyist and commercial growers. Here is what sets it apart based on the product’s confirmed characteristics:

• Phosphorus-forward bloom formula: Tiger Bloom is a phosphorus fertilizer with added nitrogen. Phosphorus is the primary driver of root energy transfer during flowering, supporting the development of flowers, fruits, and multiple budding sites. The inclusion of nitrogen helps sustain vegetative structure even as the plant channels energy into reproduction.
• Low-pH formulation for micronutrient access: The product is deliberately formulated at a low pH. This keeps micronutrients — many of which become unavailable at neutral to high pH — accessible to plants throughout the product’s shelf life and in the root zone. It also contributes to storage stability, meaning the concentrated liquid maintains its nutrient profile over time without significant degradation.
• Compatible with hydroponics and soil: Tiger Bloom is not limited to one growing medium. It works as a reservoir additive in hydroponic setups and as a soil drench in traditional container and in-ground grows. This versatility makes it useful across different production environments without requiring a separate product for each.
• Foliar application option: In addition to root feeding, Tiger Bloom can be applied as a foliar spray. According to FoxFarm’s guidance, the spray should be directed to both sides of the leaves during the early morning hours, when stomata are open and the plant is most receptive to foliar uptake.
• 2.5-gallon economy size: The 2.5-gallon container offers a volume appropriate for growers who run multiple feeding cycles or larger plant counts. At a dose of 2–3 teaspoons per gallon of water, this size provides a substantial number of applications before requiring reorder.

Best Uses for FoxFarm Tiger Bloom 2.5 Gallon

Tiger Bloom is categorized under Growth & Bloom Boosters in the Nutrients & Additives lineup. The following use cases are grounded directly in the product description and its confirmed category classification:

• Transitioning plants from vegetative to flowering stage: Tiger Bloom is introduced at the first visible signs of flowering. At this point, a plant’s phosphorus demand increases significantly as it redirects energy from leaf and stem growth toward reproductive structures. Adding Tiger Bloom at this transition supports the shift without abruptly cutting off nitrogen support.
• Promoting fruit set and bud development in flowering crops: The formula is described as designed to encourage abundant fruit, flower, and multiple bud development. It is appropriate for fruiting vegetables, flowers, and any crop where yield per plant is the primary performance metric.
• Hydroponic reservoir feeding: In recirculating or drain-to-waste hydroponic systems, Tiger Bloom can be added directly to the reservoir following the recommended dose rate. Its formulation is compatible with hydroponic applications, and the low pH helps maintain nutrient stability in solution.
• Soil and container plant feeding: For soil-grown plants in containers or raised beds, Tiger Bloom is applied as a root drench at the same 2–3 teaspoons per gallon rate. It feeds through the root zone and is appropriate for any soil-based growing environment.
• Foliar supplementation during early bloom: When applied as a foliar spray — to both sides of leaves early in the morning — Tiger Bloom provides a secondary uptake pathway that can be useful if root zone conditions are limiting nutrient absorption.
• Ongoing bloom feeding through harvest: Unlike some bloom boosters intended only for a specific window, Tiger Bloom is recommended for use from first flowering all the way through harvest, making it a single product that can carry the entire bloom cycle without additional bloom-phase switching.

FoxFarm Tiger Bloom vs Similar Bloom Fertilizers

FoxFarm Tiger Bloom occupies a specific position in the bloom fertilizer category: it is a liquid concentrate with a phosphorus-forward NPK profile, delivered in a low-pH carrier that stabilizes the formula over time. Growers comparing it to other liquid bloom products should consider the following factors based on what is confirmed in the product documentation:

Phosphorus emphasis vs. balanced bloom formulas: Some bloom fertilizers use a more balanced NPK ratio where nitrogen, phosphorus, and potassium are kept relatively equal throughout the bloom phase. Tiger Bloom prioritizes phosphorus while retaining nitrogen support. This approach is suited to crops with high fruit or flower load where phosphorus demand peaks during bud set.

Liquid concentrate vs. dry or powder alternatives: Liquid concentrates like Tiger Bloom dissolve completely in water with no mixing residue, which is an advantage in hydroponic systems where undissolved particles can clog drippers and emitters. Dry or crystalline bloom fertilizers may offer lower shipping weight per dose but require more thorough agitation to dissolve fully.

Soil and hydro compatibility vs. hydro-only formulas: Some bloom fertilizers are optimized specifically for recirculating hydroponic systems and may contain chelated micronutrients calibrated to the EC ranges typical of those systems. Tiger Bloom’s dual compatibility with hydroponic and soil applications makes it more versatile for growers who run mixed operations or want a single product across different rooms or setups.

If you are also evaluating root health and microbial support alongside your bloom nutrient program, Heavy 16 Roots is a separate root-zone product worth comparing for complementary use during the bloom phase. For growers interested in molasses-based carbohydrate supplements as a companion to bloom feeding, Earth Juice Hi-Brix Molasses is a common pairing in organic and transitional soil programs.

Compatibility

FoxFarm Tiger Bloom 2.5 Gallon is designed for broad compatibility across common growing environments and is confirmed to work in the following contexts based on the product description:

• Hydroponic systems: Tiger Bloom is formulated for use in hydroponic applications. It can be added to reservoirs in recirculating systems (DWC, NFT, ebb-and-flow) as well as drain-to-waste configurations. The liquid concentrate format eliminates the risk of undissolved particulate blocking irrigation lines.
• Soil and soilless media: The product is equally suited for use in soil-based container grows, raised beds, and soilless media such as coco coir or perlite mixes. Apply as a root drench at the standard dose.
• Foliar spray systems: Tiger Bloom can be applied through handheld or boom-style foliar sprayers. When used as a foliar application, direct the spray to both the upper and lower surfaces of leaves during the early morning. Avoid foliar application under intense lighting or during the heat of the day to reduce evaporation and potential leaf burn.
• Bloom-phase feeding programs: Tiger Bloom is intended as a bloom-phase fertilizer and can be incorporated into multi-part nutrient programs. Growers running a base nutrient system alongside bloom additives should check combined EC against target ranges for the crop and growth stage to avoid over-fertilization.

The product’s low-pH formulation helps maintain micronutrient availability in the solution or soil pore water. Growers should still verify and adjust the final pH of their feed solution after adding Tiger Bloom to ensure it falls within the optimal range for their growing medium (typically 5.8–6.2 for hydroponics and 6.0–6.8 for soil).

Dosing Guidelines for FoxFarm Tiger Bloom

The following dosing information is sourced directly from the product description. These are the manufacturer-published guidelines for this product.

• Standard dose: 2–3 teaspoons (approximately 10–15 mL) per gallon of water. Begin at the lower end of this range at the first signs of flowering and adjust based on plant response and EC readings.
• Timing: Introduce Tiger Bloom when flowering is first visible. Continue through harvest. The product is not typically used during the vegetative stage.
• Root drench application: Mix the measured dose into your water or reservoir before applying to the root zone. In hydroponic systems, add to the reservoir and circulate to ensure even distribution.
• Foliar spray application: Apply to both sides of the leaves early in the morning, when stomatal openings are widest. Allow foliage to dry before lights-on periods in indoor grows. Use the same general dose concentration as a starting point and dilute further if leaf sensitivity is observed.
• Frequency: Tiger Bloom is typically applied at every watering or reservoir change during the bloom phase. Monitor plant response, runoff EC, and visual indicators between feedings to determine if frequency or dose adjustment is needed.

As with any concentrated nutrient product, mix thoroughly and verify EC is within the target range for the growth stage after preparing the feed solution. Also check and adjust pH after mixing, since the addition of nutrients will shift the solution pH from the baseline water pH.

How to Use FoxFarm Tiger Bloom

1. Identify the right growth stage: Begin using Tiger Bloom at the first visible signs of flowering — typically when flower sites appear and the plant has transitioned from its vegetative growth pattern. Do not apply during the seedling or early vegetative stage.
2. Measure the dose: Shake or stir the concentrate before use. Measure 2–3 teaspoons (approximately 10–15 mL) per gallon of water using a calibrated measuring tool. Start at 2 teaspoons for the first application and increase to 3 teaspoons if plants respond well.
3. Add to water or reservoir: For root drench use, add the measured concentrate to your water or hydroponic reservoir. Mix thoroughly. For foliar use, prepare a separate dilution in a clean spray bottle or foliar sprayer.
4. Check and adjust EC: After mixing, use an EC/TDS meter to verify the feed solution is within your target range for the flowering stage. Excessive EC can cause nutrient lockout or tip burn; insufficient EC may slow flowering progress.
5. Check and adjust pH: Measure the pH of the prepared solution and adjust to the appropriate target range — 5.8–6.2 for hydroponic systems and 6.0–6.8 for soil. Tiger Bloom’s low-pH formulation will lower the solution pH from your baseline water.
6. Apply to plants: For root feeding, apply directly to the soil or run through the hydroponic system. For foliar feeding, spray both sides of the leaves early in the morning. Avoid getting foliar spray on open flower sites.
7. Continue through harvest: Apply Tiger Bloom at each watering or reservoir change from first flower through harvest. Monitor plant response and adjust dose within the 2–3 teaspoon range as needed based on plant health and production goals.

If you are supplementing your program with a microbial root product like Advanced Nutrients Tarantula, introduce that product according to its own guidelines and check combined nutrient interactions before adding to the same reservoir or soil drench.

Sources & Further Reading