A specially developed extra-iron formulation for crops like vegetative petunias that thrive in growing media with a lower pH.

*B (Base) formulation can be used alone or rotated with a C (Customizing) component
*Effective for all Water Types
*Contains extra magnesium plus a full range of essential micronutrients

Premium all-purpose formulation produces a nearly neutral reaction to help maintain steady pH in growing media. Contains calcium, magnesium and other minor elements.

Highly effective stand-alone fertilizer with extra magnesium to maintain deep green foliage.

*B (Base) formulation for constant, balanced nutrition
*Excellent stand-alone for Water Types 3 and 4; use as a base in Water Types 1 and 2
*Contains a complete range of essential micronutrients

Crops that are sensitive to excess micronutrients thrive with this classic formula with its acidifying action that corrects an overload of growing media pH. Contains a full range of essential micronutrients.

Versatile formula can be used in year-around operations; acidifying action corrects excessive pH in growing media. Contains a full range of essential micronutrients.

When growing media contains mineral soil, this formula provides acidifying action to help combat excessive pH. Contains a full range of essential micronutrients.

A low-phosphate feed that encourages dense, compact, healthy growth in plugs, liners, bedding plants and vegetable transplants.

*B (Base) formulation can be used alone or rotated with a C (Customizing) component
*Effective for all Water Types
*Contains a full range of essential micronutrients

Contains elevated iron and magnesium levels as well as the M-77r chelated micronutrients package specifically designed for petunias and other high iron demanding crops.

This is a high nitrate N and low-phosphate feed that encourages dense, compact, healthy growth in petunias and other flowering crops.

*B (Base) formulation can be used alone or rotated with a C (Customizing) component
*Effective for all Water Types
*Contains a full range of essential micronutrients

Moderately acidic formulation serves as an excellent all-purpose fertilizer for Types 3 and 4 irrigation water. Contains a complete range of essential micronutrients.

Produce healthy, acid-loving crops with this formula's high potential acidity that offsets high water alkalinity or lowers pH levels in growing media.
*C (Customizing) component can be used with a variety of B (Base) formulations
*Excellent choice for Water Types 3 and 4
*Contains a full range of essential micronutrients plus extra iron to promote greening

Designed exclusively for hydroponic culture, this classic formula is ideal for most hydroponic crops, especially tomatoes, cucumbers and lettuce. Buffered to help maintain acceptable working solution pH.

Grower Media Nutrient Charge is easy to use. Contains major, secondary and trace elements. Incorporated at 2 lb per cubic yard of medium. Add Uni-Mix, limestone and wetting agent to growing media blend for professional results. 50 lb bag.

Applied as a foliar spray to safely add calcium to plant tissue.

Applied as a foliar spray to safely add calcium to plant tissue.

Applied as a foliar spray to safely add calcium to plant tissue.

Need a Boost of Flower Power? Our 1:3:2 major nutrient ratio has been trusted by Jack's Professional growers for over 70 years. This soluble and available nutrient combination stimulates blooming, resulting in heavy bud and fruit set.

Need a Boost of Flower Power? Our 1:3:2 major nutrient ratio has been trusted by Jack's Professional growers for over 70 years. This soluble and available nutrient combination stimulates blooming, resulting in heavy bud and fruit set.

For the Purest in you. This one part nutrient blend is designed for crops grown in very low alkalinity waters such as reverse osmosis (RO) water, rainwater, and distilled water. Formulated utilizing the innovative raw materials to reduce pH crash while delivering all the nutrients essential for vigorous plant growth.

For the Purest in you. This one part nutrient blend is designed for crops grown in very low alkalinity waters such as reverse osmosis (RO) water, rainwater, and distilled water. Formulated utilizing the innovative raw materials to reduce pH crash while delivering all the nutrients essential for vigorous plant growth.

An essential "Part B" provides a very soluble and available source of calcium in a two-part nutrient system. Contains very pure and completely available calcium and nitrate nitrogen nutrient sources.

Prefer Tap Water? Allow your plants to drink up this formula designed to provide all the macro, secondary and micro nutrients in a one-part system. Specifically formulated for tap, city or well water types with slightly higher alkalinity & pH. This combination of nutrients will lower pH over time while including the extra soluble calcium, magnesium and the right balance of micronutrients.

Prefer Tap Water? Allow your plants to drink up this formula designed to provide all the macro, secondary and micro nutrients in a one-part system. Specifically formulated for tap, city or well water types with slightly higher alkalinity & pH. This combination of nutrients will lower pH over time while including the extra soluble calcium, magnesium and the right balance of micronutrients.

Like a shot gun start for your new plants - this formula will help promote strong and fast root growth and expansion. Best used for fertilizing young seedlings, transplants, clones and newly set rooted cuttings.

Like a shot gun start for your new plants - this formula will help promote strong and fast root growth and expansion. Best used for fertilizing young seedlings, transplants, clones and newly set rooted cuttings.

An improvement on the classic "Part A" formula for general vegetative growing. This redesigned blend is built with purely soluble and available nutrients to allow the grower maximum flexibility. Specific balance of macro, secondary and micronutrients delivers an efficient combination of nutrients suitable for many different growing environments and crop types.

An improvement on the classic "Part A" formula for general vegetative growing. This redesigned blend is built with purely soluble and available nutrients to allow the grower maximum flexibility. Specific balance of macro, secondary and micronutrients delivers an efficient combination of nutrients suitable for many different growing environments and crop types.

Get ready for a serious boost of available phosphorus. The primary goal of this formula is to assist in shutting down the strong vegetative growth stage of the plant and stimulate a switch to the reproductive or flowering phase of plant and flower development.

Get ready for a serious boost of available phosphorus. The primary goal of this formula is to assist in shutting down the strong vegetative growth stage of the plant and stimulate a switch to the reproductive or flowering phase of plant and flower development.

You've always been told to finish strong. This formula is ideally formulated for this purpose to provide your plants with a very low nitrogen, high phosphorus and very high potassium content to keep the whole plant happy to the end of its crop cycle.

You've always been told to finish strong. This formula is ideally formulated for this purpose to provide your plants with a very low nitrogen, high phosphorus and very high potassium content to keep the whole plant happy to the end of its crop cycle.

An essential "Part B" provides a very soluble and available source of calcium in a two-part nutrient system. Contains very pure and completely available calcium and nitrate nitrogen nutrient sources.

Use this high phosphorus formulation during periods of bud set to increase number and size of blossoms. Resume use of traditional production fertilizers for the remainder of growing cycle to avoid internode stretch. Great for vegetable production.
For use on: Flowering plants

This product is designed to get plants off to a good start, but is most effective when a liquid feed with the appropriate Jack's Professional fertilizer is initiated immediately after planting. Incorporate at the rate of 2 lbs. per cubic yard of mix for most growing situations. Available with or without wetting agent.
For use on: All media mixes

An ideal fertilizer for plug and young plant production. A complete formula with 6% soluble calcium and 3% soluble magnesium. It is formulated with 94% nitrate nitrogen to provide an easy to uptake nitrogen form for new roots and also low light, cooler conditions. Low phosphorus and a balanced micronutreint package helps promote compact, sturdy plugs.
*Grower Note: This formula is potentially basic. Over time, use of this formula will cause the pH of the plant root zone to increase.
For use on: All plants

Jack's Dark Weather formula is one of our most popular when growers are looking for a way to increase calcium into their fertility program. An ideal product for growers who want a non-phosphorus, high nitrate product with calcium. Alternate with 20-10-20 Peat-Lite or use as a "finisher" for flowering plants like poinsettias. This formula has the traditional micronutrient levels needed for general production.
For use on: All plants. Especially useful for plants that have a higher Ca requirement , like tomatoes and poinsettias

Jack's Dark weather Peat-Lite is an ideal product for growers who want a non-phosphorus, high nitrate product with calcium. The macro nutrient and secondary nutreint levels are very similar to the standard Dark Weather formula, however the biggest benefit you will get when using this formula is the elevated micronutrient levels.
Any prodcut that has the Peat-Lite tag in the name designates that the micronutrient package is elevated to provide a boost of micros when growing in a soilless or "peat-lite" mix.
Alternate with 20-10-20 Peat-Lite or use as a "finisher" for flowering plants like poinsettias. This formula has the Peat-lite micronutrient levels needed for commercially made peat-lite potting media.
For use on: All plants. Especially useful for plants that have a higher Ca requirement like Poinsettias and Tomatoes.

Jack's Pot Mum Finisher is an old school favorite originaly designed by Bob Peters when large cut mums were phasing out and new mums grown in pots were all the rage.
A smart formulation choice to finish many different crops. The nitrogen to potassium ratio (1:2) is excellent for pot mum production and for other crops with high potassium requirements. This fertilizer has the traditional micronutrient levels found in general purpose formulations.
For use on: Pot Mums, but also great as a finisher for many other spring into summer crops.

Jack's Geranium 15-15-15 is well known as Dr. Cari Peters' favorite formula. An ideal fertilizer for geraniums and other neutral pH loving plants. Dr. Cari spent a significant portion of her Masters and PhD program studying the effect of nutritional imbalances in many different types of geraniums. After all that time, she still believes in the simple strength of this formula.
The high phosphorus content promotes strong root growth and bud set in the plant (also, great for pink hydrangeas). The high nitrate nitrogen content (56%) and the general-purpose level of micronutrients help minimize nutritional toxicities on geraniums.
This formula grows fantastic geraniums when you have a good source of calcium already in your water source. Its slightly acidic nature keeps pH on the downward trend without causing pH drop out in the plant root zone.
*Note*--if water source does not have over 40 ppm Ca, or is slightly acidic, growers can use this formula as an alternate with the standard 15-5-15 and still see many of the greening and blooming effects we love from the Geranium 15-15-15.
For use on: Geraniums, marigolds, and other plants with media pH requirements above 6.2.

Jack's 15-16-17 is a nice variation of Geranium Special 15-15-15 with slightly elevated micro nutients. With a ratio similar to 20-20-20 but with over 60% nitrate nitrogen, boosted micronutrient levels, and much less acidic reaction in the root media. The balanced N-P-K ratio is excellent for producing fast-growing plants or for maintaining plants in a sales environment.
For use on: All plants, especially our friend, the geranium. More importantly, a great choice when trying to maintain finished plants in a garden center.

The ideal fertilizer for encouraging overall healthy plant growth, a strong root system, and rapid development of all plants. Its high phosphorus content encourages rapid root generation which eliminates transplant shock when used as a transplanting solution.

Designed specifically for spring pansy production. High Nitrate and Low Phosphorus control plant stretch in low light growing. This formula contains a good amount of soluble Calcium and Magnesium as well as the extra Boron that Pansies often need on a constant basis. This balance along with our Iron FeED package will keep pansies compact and green with a strong flower for a beautiful early spring crop.
For use on: Fertility programs that require additional Ca, Mg, B & Mn.

This product is designed to fit the needs of the newer poinsettia cultivars that require micronutrients, but a lesser amount of macronutrients, containing 50% more iron, manganese, copper and zinc than found in typical poinsettia peat-lite formulations. The Fe package is made from our exclusive blend of the 3 iron chelates - to keep iron available at higher pH levels.
Growers should consider making the switch to this formula if in the past you have used 15-5-15. The formula design takes the extra supplement and mixing steps out of the older poinsettia fertility recommendations.
Extra soluble molybdendum added to the formula to reduce or eliminate the extra step of adding molybdendum to each stock tank. Low boron levels help prevent toxicity problems.
For use on: Dark leaved Varieties, Light leaved varieties.

This fertilizer contains more than 70% nitrate nitrogen and has a micronutrient package adjusted for poinsettias (lower boron and increased magnesium, zinc, and molybdenum). An ideal choice for low alkalinity waters when the feed program is supplemented with calcium-containing products.
For use on: Poinsettias

Designed to deliver a complete and innovative nutrient balance all from a one bag formula. Formulated specifically for hydroponically grown herbs and lettuce and has been used successfully across many hydro, aqua, and aeroponically grown systems and crops.
Our research has shown that using this fertilizer from day 1, will dramatically increase root production and branching. Time to transplant into hydroponic solution will be 2x's faster than the typical method of a clear water start. Give your plants just the right amount of nutrients from the begining and you will see dramatic results.
For use on: Herbs, all types lettuce, Hydro garden crops

Designed specifically for late summer and early fall pansy production. A nitrate / ammonium nitrogen system is more efficient in warmer weather than the traditional high nitrate pansy fertilizer. The result is a potentially acidic product that will lower media pH over time.
For use on: Designed specifically for pansy production in late summer and early fall.

This product is designed to fit the needs of the newer poinsettia cultivars that require micronutrients, but a lesser amount of macronutrients, containing 50% more iron, manganese, copper and zinc than found in typical poinsettia peat-lite formulations. Low boron levels help prevent toxicity problems.
For use on: Dark leaved Varieties

High nitrate nitrogen, low potential acidity fertilizer. Enhanced magnesium and sulfur levels can reduce the need for epsom salts. Good for use when cool, dark growing conditions are prevalent and no additional calcium is required. The additional level of micronutrients provides necessary elements absent from most commercially made peat-lite potting media.
For use on: Great for all crops, especially poinsettias and geraniums, tropicals like hibiscus.

One of the most popular formulations, 20-10-20 GP has the traditional micronutrient levels needed for general production including propagation and all types of bedding plants. High nitrate nitrogen levels (60% of the total) provides for green foliage and more compact growth.

The most popular formulation, 20-10-20 Peat-Lite. A traditional 2:1:2 balanced ratio formula with a 60% Nitrate to 40% Ammonical Nitrogen balance. Also will deleiver approximately twice the level of micronutrients as the GP formulation. The additional level of micronutrients provides necessary elements absent from most commercially made peat-lite potting media.
For use on: All greenhouse plants grown in peat-lite mixes.

The general-purpose industry standard, 20-20-20 is great for maintaining plants in garden center and growing facilities. It provides fast green-up and great foliar expansion due to the high percentage of ammonium and urea nitrogen plus balanced phosphorus and potassium for excellent root and shoot growth.
For use on: All outdoor grown plants.

This product is specially formulated for those chronically iron-hungry crops such as petunia, calibrachoa, bacopa and others. The original Jack's FeED product designed with all three iron chelates, EDTA, DTPA and EDDHA. Our proprietary blend of iron level is unmatched by any competitor and guaranteed to deliver iron at a much broader range of pH over the entire crop cycle. This nutrient profile is also paired with a low phosphorus level to help prevent excessive elongation. It is not recommended for use on geraniums or other iron sensitive crops.
For use on: Petunia, Calibrachoa, Bacopa

This is an ideal fertilizer for acid-loving plants in the nursery and landscape. Provides a rapid correction of a high pH situation. Unlike other brands, Jack's 21-7-7 Acid contains no harmful chlorides.
For use on: Acid loving plant in nursery and landscape, such as rhododendrons, azaleas, and evergreens.

This formula is specifically formulated for the heavy feeding mum crop. It is a high nitrate, high potential acidity formulation that mums require. Extra magnesium is added for improved greening. Contains Peat-Lite trace element level. It also provides a 5% increased efficiency compared to 20-10-20 formula which stretches your fertilizer dollar without compromising performance.
For use on: Garden Mums

Mums are heavy feeders that respond well to additional magnesium, sulfur and iron. Many times though, the iron becomes unavailable as the pH rises. The elevated iron levels found in the exclusive FeED iron chelate system keeps the iron available to the plant even if the pH rises during the crop cycle. The additional 2% Nitrogen in the formula reduces your fertilizer usage by approximately 10%, making this product not only nutritionally effective, but cost effective as well.
For use on: Garden Mums, Iron loving warm weather plants

A great choice for plants grown in warm conditions. The 3:1:2 ratio is considered ideal for tropical foliage plant production and is useful in interiorscape applications. Its high potential acidity is helpful in controlling media pH when moderate to high alkalinity irrigation waters are used.
For use on: Tropical foliage production and interiorscape installations

High efficiency formula designed to maximize your NPK delivery while keeping a balance of macro, secondary and micronutrients for optimum plant growth. Best as a continuous feed for heavy feeding plants in moderate to warm temperatures. Micronutrient levels are comparable to peat-lite formulas. Can be used as a nutrient booster for great green-up for almost all varieties.
For use on: All bedding plants and vegetable transplants

It is true! Plants can feed through the leaves. This fertilizer is specially formulated to use for foliar feeding of ornamentals, vegetables and fruits. The high urea content and micronutrients promote green-up and foliar expansion. Can be used in conjunction with normal media fertilization or alone. Addition of a surfactant enhances activity.
For use on: Field and high tunnel grown fruit and vegetable crops. Also has been used with great success on foliar applications of hay fields.

This 1-2-4 finisher has been formulated especially for high tunnel tomato production. 30% potassium helps ripen tomatoes and fend off yellow shoulder

Initial use of 9-45-15 when transplanting into cells or beds supplies the high-phosphorus ratio designed to boost root growth prior to shoots. Can also be used to correct or supplement low phosphorus situations, especially in outdoor production.
For use on: Field grown vegetables