Mega Crop, ProMix and grow bags

I'm completely new to this, aside from when I grew a single plant some 40 years ago in a closet using an aquarium bulb, haha. A lot has changed over the years.

I've got four 25 gallon grow bags filled with ProMix along with a tiny amount of generic potting soil. I've just ordered some Mega Crop after reading reviews, and also just because I was overwhelmed by nute choices for my first medicine grow.

I understand you should water with MC added to the water at every watering. It is looking like I will only have to water maybe once a week at this time, as I've watered three days ago and the mix is still pretty moist. Things just don't dry out in Hawaii the same way they did in California. The question is, how much solution should I apply. I know how to mix it (grams per gallon), but I'm just wondering about volume at this point. Each 25 gallon bag took a lot of water initially to moisten, so I can't see watering with that much nutrient solution (or should I?)... and was thinking a gallon of solution per week or every watering, along with just plain water. I water with rain water and don't know the pH, the soil mix is neutral. All I know is that I don't want to oversaturate the soil with moisture, and that with nutrients, less is usually better.

Thanks for any pointers.

ThailandBound said:

I'm completely new to this, aside from when I grew a single plant some 40 years ago in a closet using an aquarium bulb, haha. A lot has changed over the years.

I've got four 25 gallon grow bags filled with ProMix along with a tiny amount of generic potting soil. I've just ordered some Mega Crop after reading reviews, and also just because I was overwhelmed by nute choices for my first medicine grow.

I understand you should water with MC added to the water at every watering. It is looking like I will only have to water maybe once a week at this time, as I've watered three days ago and the mix is still pretty moist. Things just don't dry out in Hawaii the same way they did in California. The question is, how much solution should I apply. I know how to mix it (grams per gallon), but I'm just wondering about volume at this point. Each 25 gallon bag took a lot of water initially to moisten, so I can't see watering with that much nutrient solution (or should I?)... and was thinking a gallon of solution per week or every watering, along with just plain water. I water with rain water and don't know the pH, the soil mix is neutral. All I know is that I don't want to oversaturate the soil with moisture, and that with nutrients, less is usually better.

Thanks for any pointers.

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Water away from the dripline of the leaves. Slowly and around the plant. Use enough to reach down where the roots will be reaching. Again not close to the plant but where you think the roots have stretched and then outside that a bit as well. Enough to soak down about a foot is fine to start.

This is not ideal for the medium to start in containers this big. So to prevent unused nutes building up you should water twice for every feeding you give. They can thrive with very few nutes. Don’t overdo it. Once the roots are well established the plant will really start to grow. That’s when you use enough feed or water to thoroughly soak so the lowest point is reached. Then do not overwater.

hotrodharley said:

Water away from the dripline of the leaves. Slowly and around the plant. Use enough to reach down where the roots will be reaching. Again not close to the plant but where you think the roots have stretched and then outside that a bit as well. Enough to soak down about a foot is fine to start.

This is not ideal for the medium to start in containers this big. So to prevent unused nutes building up you should water twice for every feeding you give. They can thrive with very few nutes. Don’t overdo it. Once the roots are well established the plant will really start to grow. That’s when you use enough feed or water to thoroughly soak so the lowest point is reached. Then do not overwater.

Click to expand...

Thanks for the reply! I forgot to mention that someone had given me 4 clones that appear (not that I really know) to be about a month or so old. So anyway, that is what I have in the four bags. They are all about a foot and a half tall, and kind of wispy, and came out of one gallon containers. I figure they will like their new home and hopefully take off soon. I won't get the Mega Crop until this coming Tuesday or Wednesday when it arrives in the mail, so I'm figuring the first feeding will be done on one of those days (3-4 days from now).

I certainly don't want to overwater and I guess I will learn along the way, but due to old habit, I never water if the soil is still moist in the top couple of inches. I suspect the ProMix will still be damp, so for me, normally I wouldn't water. I do want to feed them though, as I'm only vegging for a month with these, that is all the time I've got. This is why I was wondering if a gallon of solution would be enough in order to give them a boost without overdoing it due to the already moist soil mix.

ThailandBound said:

Thanks for the reply! I forgot to mention that someone had given me 4 clones that appear (not that I really know) to be about a month or so old. So anyway, that is what I have in the four bags. They are all about a foot and a half tall, and kind of wispy, and came out of one gallon containers. I figure they will like their new home and hopefully take off soon. I won't get the Mega Crop until this coming Tuesday or Wednesday when it arrives in the mail, so I'm figuring the first feeding will be done on one of those days (3-4 days from now).

I certainly don't want to overwater and I guess I will learn along the way, but due to old habit, I never water if the soil is still moist in the top couple of inches. I suspect the ProMix will still be damp, so for me, normally I wouldn't water. I do want to feed them though, as I'm only vegging for a month with these, that is all the time I've got. This is why I was wondering if a gallon of solution would be enough in order to give them a boost without overdoing it due to the already moist soil mix.

Click to expand...

You won’t see the clones really grow much until roots start finding boundaries. By not watering close to the plant it forces the roots to stretch for the little water there is. Encourages tough plants. Be patient waiting for the growing to get after it. Once they start they’ll go.Try a gallon. They’ll really droop if it’s not enough but they absolutely won’t die of thirst.

Personally I would soak it down with 1g/L(4g/USG) of the mega crop and not water again for a couple weeks with plants that size in those big containers. Roots will be at the bottom by then for sure.

I wouldn't put a 4" clone into a 5 gallon pot and only give it a cup of water I'd soak it in good like I do all the time.

I'm using HP and Mega Crop indoors right now and loving it. Using some organic inputs and myco this grow too for a semi-organic grow just to see if it adds some better scents etc to the usual hydro nutes in plain HP.

You could feed it well and let a lot of water run out. With fabric pots and HP you shouldn't have to worry about overwatering. I'd be more worried about rain soaking them too much if you're growing outdoors which I assume you are with pots that big.

I used to let my pots dry right out but trying to water less more frequently but still soaking the pots to runoff each time. The myco doesn't like to get dry and I feed carbo each time for them too. Kind of like a manual fertigation method.

I've used AN for 20 years and going to stick with the Mega Crop for a while.

Good luck with yours!