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Yep, I'm growing in soil. The fertilizer is the PROMIX granular ferts, I have three kinds, all bought from Rona garden centre lol.Not much help on the expired part… other than to say it can easily clump up with moisture unless stored properly and it can cause rust or corrosion on other materials as it leaches chemical salts
that stuff is not necessarily organic, it starts with some organic inputs and chemical salts. Lawn & garden ferts like 10-10-10 is not really for this crop but I’m sure it’s been used. Mostly we use 2 different formulas a higher N but lower PK for veg, less N but more PK for flower, of course calcium magnesium and all the trimmings
Geoflora makes a nice organic dry mix fert, you need 2 bags, 1 for veg and 1 for flower since ratios are different. Add it to your soil mix when you make up a container, then top dress every 2 weeks and water in… we like Geoflora cuz it’s easy, works well and they are 420 site sponsor.
mostly we steer folks towards cannabis specific nutes, growing big nugs requires lots of light & nutes. There’s other stuff like MC the nute that shall not be named.. it’s good and cheap.
Whats NPK ratio of your expired fert? Got a pic or brand name?
I’m guessing you are growing in soil?
A couple of questions just so we are all on the same page.I have the nitrogen one 7-3-3, the bloom one 3-7-3, and the fruit one 4-4-8. I used them last grow, my plants seemed to grow okay. I don't really care for the last one, but the first two I plan to use and then possibly finish the grow using potassium sulphate, not sure as of yet.
I grabbed the 7-3-3 and the 4-4-8 from walmart to supplement the PROMIX potting soil I obtained from there as well. Promix potting soil is terrible and I'll never use it again. I didn't realize that they also sold a bloom fertilizer as well (3-7-3) else I would have grabbed that one instead of the 4-4-8. I had to go to Rona to grab the bloom one, as it wasn't sold at any of the other nearby dept stores.I have been using fertilizers for decades as part of my job or at home. Fertilizers do not expire. They do not suddenly disappear or turn into something else at midnight on a certain date. The dates on food or some other products are not true "expire on dates".
Dry fertilizers, including organic based ones, can last for 5 to 25 or more years as long as they are kept dry. The important word is "dry". If the bag or box has been opened up it should be closed back up properly to keep water and humid air out. Liquid fertilizers can last 10 years or longer as long as the bottle is closed up properly after use. Stored dry fertilizers should be kept cool for best shelf life. Stored liquid fertilizers should be kept cool but not allowed to freeze.
The shelf life of anything used for insect, fungus/mold or weed control will slowly become less effective even if mixed with fertilizer.
As usual there is a "however". However, if the dry or liquid fertilizer is mixed with water any unused mixture could last a day to maybe a week depending on what the concentrate was made from. Figure on mixing up only as much as will be needed that day. If more is needed in the next couple of days mix up a new batch.
A couple of questions just so we are all on the same page.
I have to figure that you know what each number means and what the combination of three numbers means. Why did you choose those particular fertilizer mixes?
Why the Potassium Sulfate? I have to believe that you will be better off with the 4-4-8 fertilizer
I recommend all three of them.I grabbed the 7-3-3 and the 4-4-8 from walmart to supplement the PROMIX potting soil I obtained from there as well. Promix potting soil is terrible and I'll never use it again. I didn't realize that they also sold a bloom fertilizer as well (3-7-3) else I would have grabbed that one instead of the 4-4-8. I had to go to Rona to grab the bloom one, as it wasn't sold at any of the other nearby dept stores.
I have experimented with higher Potassium amounts and it did nothing for making the buds denser. I applied high amounts of Potassium at once a week starting when the plant had been flowering for at least 4 weeks. Too much Potassium and the buds never grew large and the remaining leaves looked unhealthy.From what I've read about potassium sulphate it's a power substance; buds become mighty dense after application two weeks from harvest. The NPK of that stuff is 0-0-20, therefore it's probably better to use for bud density than something with an NPK of 4-4-8