Jack's Classic Blossom Booster 10-30-20 | 8oz (Case of 12)

High-Phosphorus Bloom Fertilizer, 10-30-20, 8oz

Pushing more and bigger blooms out of a flowering plant takes more than an all-purpose feed. Jack's Classic Blossom Booster is a professional 10-30-20 formula built for more flowers and brighter colors on all outdoor and indoor plants, with micronutrients included.

8oz size, sold in a case of 12, high-phosphorus bloom formula.

Key Features & Benefits

• 10-30-20 high-phosphorus, moderate-potassium formula — manufacturer-confirmed acidic, 100% water-soluble fertilizer.
• Formulated to increase bloom number and size — targets flowering rather than general foliage growth.
• Includes micronutrients — supports overall plant health alongside the bloom-focused NPK ratio.
• Water-resistant label, plastic tub — holds up to regular scooping and mixing without label wear.

Who Should Use Jack's Classic Blossom Booster

This fits growers with flowering outdoor or indoor plants who want a temporary, targeted phosphorus boost during bud set rather than an everyday all-purpose feed.

About JR Peters / Jack's Classic

Jack's Classic is JR Peters' retail-size water-soluble fertilizer line, backed by a family-run manufacturer whose lab and manufacturing facility are co-located, allowing rapid plant-tissue and water sample turnaround for growers.

Frequently Asked Questions

How and when should Blossom Booster be applied?

Use it during bud set or flower formation when the high-phosphorus 10-30-20 ratio can do the most to increase bloom number and size, then switch back to a balanced everyday fertilizer for the rest of the growing cycle. JR Peters recommends this temporary-use pattern specifically to avoid internode stretch, or excessive stem elongation, from prolonged high-phosphorus feeding.

Why is this formula so high in phosphorus relative to nitrogen?

The 10-30-20 ratio is built specifically to push bloom development, since phosphorus plays a central role in flower and fruit formation. That's different from an all-purpose formula, which balances nitrogen, phosphorus, and potassium more evenly for general growth.

Is this fertilizer meant for constant, everyday use?

No — the manufacturer's own guidance is to use it temporarily during bud set, then resume a regular production fertilizer afterward. Extended use beyond the bloom period risks internode stretch rather than continued blooming benefit.

What size and packaging is this listing?

This is the 8oz size option, sold in a case of 12. All Blossom Booster sizes share the same 10-30-20 formula and micronutrient package, so the choice comes down to how much product a grower needs on hand.