FoxFarm Open Sesame Soluble Fertilizer 5-45-19 | 2lb Jar

Early-Bloom Soluble Starter for Bud Set, 2lb

The first weeks of flowering call for a sharp phosphorus push that a standard vegetative feed doesn't supply, and starting bloom nutrition too late can mean plants are already past the ideal window for setting bud sites. FoxFarm Open Sesame 5-45-19 is a fully water-soluble powder concentrated in phosphorus, mixed into an existing feeding program right as flowering begins to drive early bud set.

The 2lb jar suits growers running multiple plants who've tested Open Sesame already.

Key Features & Benefits

• 5-45-19 NPK ratio — concentrates phosphorus specifically for the early-flowering bud-set window rather than general feeding.
• Fully water-soluble powder — dissolves completely for a clean mix into reservoirs, watering cans, or drip systems.
• First stage of a three-part soluble sequence — hands off to Beastie Bloomz for mid-bloom and Cha-Ching for the finish.
• Naturally low-pH formula — keeps phosphorus in solution and stable once mixed, so reservoir pH needs a check after adding it.
• Works across growing methods — suited to soil, coco, rockwool, and recirculating hydroponic reservoirs alike.

Who Should Use Open Sesame

Growers who run a base feeding program and want a dedicated early-bloom phosphorus boost as plants shift from vegetative growth into flowering are the right fit, particularly those already planning to follow with Beastie Bloomz and Cha-Ching through the rest of bloom.

About Fox Farms

FoxFarm has built soil mixes and micro-brewed liquid plant foods out of Humboldt County, California since 1984, and its Open Sesame soluble powder extends that same catalog into the dry, water-soluble segment of its bloom lineup.

Frequently Asked Questions

When in the flowering cycle should I start using Open Sesame?

Begin as soon as plants show the first signs of flower development, since the 5-45-19 ratio is built for triggering early bud set rather than sustaining bloom for weeks on end. Most growers transition to Beastie Bloomz within the first couple weeks of flowering as bud sites establish.

Does Open Sesame replace my regular base nutrients?

No, it's layered on top of an existing feeding program rather than used as a standalone formula, since it's concentrated specifically for the phosphorus push flowering plants need at that stage. Keep running base nutrients alongside it.

Is Open Sesame usable in a recirculating hydroponic reservoir?

Yes, it dissolves fully into solution, so it works in reservoirs, drip systems, and hand-watering alike. Because the powder is naturally acidic, check and adjust reservoir pH after it's fully mixed in.

How does Open Sesame fit with Beastie Bloomz and Cha-Ching?

The three solubles are meant to run in sequence rather than together: Open Sesame kicks off bud set early in bloom, Beastie Bloomz carries mid-to-late flowering, and Cha-Ching finishes out the last stretch before harvest. Mixing more than one at full strength at the same time isn't how the sequence is intended to run.

What's the best way to store Open Sesame between uses?

Keep the jar sealed in a cool, dry spot out of direct sun, since a soluble powder left open can pull moisture from the air and start clumping. A tightly closed lid keeps it measuring consistently from the first scoop to the last.