Jack's Professional 10-30-20 Blossom Booster Fertilizer - 25 lb

High-Phosphorus Bloom Feed for Bud Set - 25 lb Bag

Switching to a bloom-focused feed at the right time matters, and a general fertilizer often falls short on phosphorus. Jack's Professional 10-30-20 Blossom Booster supplies a high-phosphorus analysis of 10% total nitrogen, 30% available phosphate and 20% soluble potash. It is highly soluble in water and includes magnesium plus chelated micronutrients.

The 25 lb bag suits growers who feed regularly through a stock tank and injector, or who want enough product to cover several flowering cycles. It is a good fit for regular indoor growers and small commercial operations.

Key Features & Benefits

• 10-30-20 analysis — phosphorus-forward nutrition for the flowering stage.
• Highly water soluble — dissolves into a stock solution for injector or hand feeding.
• Magnesium and micronutrients — the label lists magnesium, boron, copper, iron, manganese, molybdenum and zinc.
• Mixing chart on the label — shows how much dry fertilizer to add per gallon for common injector settings.
• Not classified as a dangerous good for transport — simpler handling and shipping.

Who Should Use Jack's Professional 10-30-20 Blossom Booster

Choose this product if you grow flowering ornamentals or vegetables and want a dedicated feed for bud set before returning to a standard production fertilizer. It works for growers using constant liquid feed with an injector.

About Jack's Professional 10-30-20 Blossom Booster

This is a bloom booster fertilizer in light blue prills and crystals, sold as a 25 lb bag. The label gives a solubility limit of 4 lbs per gallon and lists 5.00% ammoniacal nitrogen and 5.00% nitrate nitrogen.

Frequently Asked Questions

Q: When should I use a bloom booster?
A: Apply it during bud set, when the plant moves into reproductive growth. The manufacturer advises returning to a standard production fertilizer afterward to keep growth balanced and limit excessive stem elongation.

Q: What do the numbers 10-30-20 mean?
A: They show the percentages of total nitrogen (10), available phosphate as P2O5 (30) and soluble potash as K2O (20). The high middle number makes it phosphorus-forward.

Q: How do I dissolve it?
A: The label recommends warm water, since some raw materials dissolve more slowly than others. Keep the stock tank covered to reduce light and debris. The solubility limit is 4 lbs per gallon.

Q: How do I set feed strength?
A: The label includes a chart of dry ounces per gallon for several nitrogen feed rates and injector ratios. It also names EC as the best way to check strength, so confirm your injector setting before use.

Q: Why does the color of the granules vary?
A: The label explains that tracer dye distribution and raw material size vary across particles in the bag. Once dissolved, the solution color stays consistent.