Jack's Classic Blossom Booster 10-30-20 | Sample Pack - 350ct

High-Phosphorus Bloom Fertilizer, 10-30-20, Sample Pack

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.

350-count sample pack, 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 350-count sample pack option. 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.