FoxFarm Open Sesame Water-Soluble Fertilizer 5-45-19 — 1 lb High-Phosphorus Bloom Booster

FoxFarm Open Sesame is a high-phosphorus, water-soluble 5-45-19 fertilizer formulated to encourage robust bud set and early flowering growth.

This concentrated bloom booster delivers an extra dose of phosphorus and potassium at the start of the flowering phase to help plants transition from vegetative growth to productive bloom. Designed to dissolve completely in water, the powder mixes easily for precise feedings in soil, containers, and hydroponic systems. Use it as part of a planned nutrient schedule beginning at the onset of flowering to supply targeted macro- and secondary nutrients where they matter most: the root zone and developing flowers.

How does Open Sesame support early-stage flowering?

Open Sesame provides a phosphorus-heavy NPK ratio (5-45-19) that supplies the elements plants use to build flower structures and metabolic energy during bloom initiation. The extra potassium supports overall plant vigor and transport of sugars into developing buds.

• High phosphorus encourages cell division and bud formation.
• Potassium aids in carbohydrate movement to flowers.
• Low nitrogen minimizes excessive leaf growth during bloom.
• Water-soluble format ensures rapid nutrient availability.

How do I mix and apply this water-soluble fertilizer?

This product dissolves fully in water for accurate dosing and even distribution. Measure according to label directions and mix thoroughly until no solids remain; apply every other watering from week five or six of the growth cycle and adjust concentration based on plant response.

• Dissolve thoroughly in room-temperature water before applying.
• Start at the recommended dose and increase only if plants show need.
• Alternate feedings with plain water to prevent salt buildup.
• Compatible with many nutrient programs—check compatibility before mixing with other concentrated additives.

Can I use Open Sesame in hydroponics as well as soil and containers?

Yes—this fertilizer is formulated for versatility across growing methods, including hydroponic setups, soilless mixes, pots, and in-ground beds. Because it’s water-soluble, it integrates easily with recirculating systems when used according to EC and reservoir management practices.

• Suitable for drip, ebb-and-flow, and recirculating hydroponic systems.
• Works in traditional soil and container-grown plants with the same mixing method.
• Monitor electrical conductivity (EC) in hydro setups to avoid overconcentration.
• Rinse or flush medium periodically to prevent salt accumulation.

What results should I expect and when?

Expect stronger bud set and more focused energy toward bloom development during the early flowering weeks. Results vary by species, growing conditions, and overall nutrient program, but many growers notice fuller bud structures and better flower uniformity when phosphorus demand is met at the onset of flowering.

• Noticeable bud initiation often appears within the first weeks of flowering.
• Improved flower uniformity across the canopy with consistent feeding.
• Reduced vegetative stretch when nitrogen is kept low during bloom.
• Adjust feeding regimen based on plant health and substrate conditions.

Who is this for: FoxFarm Open Sesame is aimed at home gardeners and growers who want a straightforward, water-soluble bloom enhancer for the transition to flowering. It suits hobbyists running containers or hydroponics as well as small-scale commercial growers who need a concentrated phosphorus boost during early bloom. If you follow a staged nutrient plan and want a dissolvable product that mixes easily and targets bud development, this fertilizer fits reliably into that feeding schedule.

Ingredients

micronutrients