I’m not sure this deserves an OG topic, it’s basically a sales pitch for Jack’s Nutrients, but it had some info I wasn’t aware of, including a new bloom formula with zero percent nitrogen, so I thought I’d toss it up for general consideration.
-Grouchy
Finishing Crops, Bottom Feeding, and Auto Watering.
New Year, Same Science
As we reflect on this year to prepare for the next, it’s time to focus on dialing in those finishing touches to ensure nutrient precision that yields a bountiful harvest.
Finish Strong
As we ring in the New Year, it’s the perfect time to reflect on growing techniques and explore new strategies for the year ahead. While we’ve seen great success with our 321 schedule, when it comes to finishing, there’s no one-size-fits-all approach—each method has its own advantages.
Method 1: Transitioning to 0-12-26 Part A
For a more tailored finish with micronutrient consistency, try our 0-12-26 Part A paired with Part B. This combination reduces total nitrogen by 33% compared to the classic Jack’s 321 program, while maintaining an easy application rate identical to 5-12-26 Part A. It’s a great choice for tapering nitrogen in late flowering stages, especially for more expressive strains. The added sulfur can also enhance terpene production, making it a standout option for the end of flower.
Method 2: Using 7-15-30 Finish
For growers looking to refine their finishing strategy, 7-15-30 Finish offers a specialized solution. This blend provides low nitrogen and extra potassium, acting as a bud hardener to help plants reach their full potential. It’s particularly well-suited for hard water sources, as it contains no calcium and is designed to be used with Epsom salt.
This New Year is a great opportunity to experiment, refine your methods, and set yourself up for an even more successful growing season. Here’s to strong finishes and an even better year ahead! 
Started from the Bottom…
Managing nutrient supply and EC in growing media is always tricky. It can be even more frustrating in systems designed to feed from the bottom.
In a traditional growing system, water and nutrients are applied to the top of a pot and runs down through the rootzone. When enough runoff is allowed, excess salts and nutrients are carried with the water and are removed from the media. When watering from the bottom, water and nutrients percolates up through the rootzone via capillary action. In this case, excess salts are carried to the uppermost layers of the growing media.
When watering from the bottom, as the EC in the rootzone climbs it can be difficult to bring it back down. Flushing from the top will only carry the salts accumulated in the top few inches of media back down into the rootzone and will likely cause additional nutrient imbalances. When this happens, it’s best to supply clear water from the bottom rather than the top. Consistency is key and if you’re irrigating from the bottom you should continue to manage your media this way!
In general, using solution with a lower starting EC is ideal for systems that irrigate through capillary action. Maintaining an EC around 1.4 mS/cm during veg and 2.2 mS/cm during flower will go a long way towards keeping the rootzone stable and your nutrients plant-available.
Finish Strong with These
Late Flower Blends
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