• Ali Bongo, Head Shop UK, buy best bong UK, Percys Grow Room
Notifications
Clear all

How much perlite can you add to soil before it effects the required ph level of 6.5

Page 1 / 2
jacks_farm
(@jacks_farm)
Linalool
100 Likes
250 Likes
500 Likes
1K Likes
Diary Writer
2.5K Likes
Known Member
Points: 8358

From my understanding, you can't over water in coco.

So in theory, If you add enough perlite too the soil mix, you won't be able to over water the soil but will this reduce the required pH level Hmm  

If we could get the balance just right for example 25%, you gain all the advantages of coco and soil 

A new grower could make the soil mix up, water every other day In a 30ltr pot and pull a massive harvest every time.

Thumbs Up

What do fellow growers think?

has anybody tried this ?

 

ReplyQuote
Topic starter Posted : December 26, 2020 4:39 pm
Zombie Nation, Doctor X, twisted1 and 5 people liked
monkeydo
(@monkeydo)
Valencene
100 Likes
250 Likes
500 Likes
Patreon
1K Likes
Diary Writer
Student
2.5K Likes
Instagram Admin
Pangolin Hunter
5K Likes
Plant of the Month Winner
Completed Diary
Stoner Movie Club
USA
Veteran
Points: 52044

Done some reading on growing in pure perlite and apparently it’s possible if done correctly but not recommended. I’m told the fines are the biggest issue because they react faster so removing those is a good start in my opinion. Screening them out would be best. The larger will have less surface exposed to the soil and should break down more slowly influencing the ph less. I used to use cottonseed meal as an amendment for nitrogen and ph down to counteract the ph rise of the perlite but I wasn’t growing cannabis in it back then. Flowers loved it though.

Random acts of kindness make the world a better place

ReplyQuote
Posted : December 26, 2020 5:57 pm
Zombie Nation, twisted1, Fish and 6 people liked
Chillbert
(@chillbert)
Myrcene
100 Likes
250 Likes
500 Likes
Diary Writer
1K Likes
Plant of the Month Winner
2.5K Likes
Patreon
Stoner Movie Club
United Kingdom
5K Likes
Respected Member
Points: 15981

@jacks_farm 👊

you can definitely over-water in coco.. it’s harder to water-log or oversaturate than soil for sure, but the amount that will achieve optimum irrigation will depend on several factors including plant size/needs and vpd.

Ive known and heard of growers who will use up to 50/50 coco / perlite.

in coco you are able to adjust pH more quickly than soil, you can mini-flush or flush much easier than soil too if you need to correct / alter your pH or EC.

So how much perlite can you put in soil without affecting pH? 
personally I think in soil the microbes will be help make pH adjustments, so long as your feed / water is at the pH you want when irrigating so you’re not getting big swings.

maybe you could soak some perlite in water pH6.5 and see how much it affects the pH in the short term. Then proceed accordingly.

something else you’ll no doubt have also considered is that by replacing more soil with perlite you’ll have less food available in your pot for your plant. 

ive stopped using perlite of late as I’m fed up of it in my beds at my allotment (where I re-use my potting soil mixes) not adding anything nutritional and ending up on the surface due to its super light particle density.

It is a very effective and easily available aeration material just not for me anymore.

Good luck achieving that perfect soil mix bro 👊 low cost and sustainable all the way 👍

 

Time to pop some more beans 😗

ReplyQuote
Posted : December 26, 2020 6:13 pm
Zombie Nation, twisted1, Fish and 5 people liked
jacks_farm
(@jacks_farm)
Linalool
100 Likes
250 Likes
500 Likes
1K Likes
Diary Writer
2.5K Likes
Known Member
Points: 8358
Posted by: @monkeydo

Done some reading on growing in pure perlite and apparently it’s possible if done correctly but not recommended. I’m told the fines are the biggest issue because they react faster so removing those is a good start in my opinion. Screening them out would be best. The larger will have less surface exposed to the soil and should break down more slowly influencing the ph less. I used to use cottonseed meal as an amendment for nitrogen and ph down to counteract the ph rise of the perlite but I wasn’t growing cannabis in it back then. Flowers loved it though.

Thanks for advice @monkeydo,

Removing the perlite dust parts sounds like a good start, adding more garden lime will take care of the pH level early flower and mid flower (top dress) and a little honey towards harvest should reduce the pH, 2 weeks before harvest.

I have know a few growers that used 100% perlite only but they water every day (few years back online).

ReplyQuote
Topic starter Posted : December 26, 2020 10:07 pm
Zombie Nation, Chillbert, Hart and 6 people liked
jacks_farm
(@jacks_farm)
Linalool
100 Likes
250 Likes
500 Likes
1K Likes
Diary Writer
2.5K Likes
Known Member
Points: 8358

@chillbert

you can definitely over-water in coco.. it’s harder to water-log or oversaturate than soil for sure, but the amount that will achieve optimum irrigation will depend on several factors including plant size/needs and vpd.

Ive known and heard of growers who will use up to 50/50 coco / perlite.

Have not grown in coco for the last 10 years so I go on what a lot of grower say online about coco, but that's good to know "definitely over-water in coco"

Didn't think about plant size/needs and the current envirment (humidity, temps) 

All this needs to be taken into consideration, you said about 50/50 coco/perlite, what do you think of 40/60 mix with perlite/soil ?

Hoping the Perlite pH level can be fixed with the right amount of garden lime at different stages 

"Amount of food" 

Going to mix in the same amount of food into the soil/perlite mix

I can see why you have stopped using perlite but I am going to fill my green house up with perlite/soil, going to take years Smile

After a year or two, I am sure I will be looking for your soil mix when I get feedup with perlite.

ReplyQuote
Topic starter Posted : December 26, 2020 10:40 pm
Zombie Nation, Hart, twisted1 and 4 people liked
monkeydo
(@monkeydo)
Valencene
100 Likes
250 Likes
500 Likes
Patreon
1K Likes
Diary Writer
Student
2.5K Likes
Instagram Admin
Pangolin Hunter
5K Likes
Plant of the Month Winner
Completed Diary
Stoner Movie Club
USA
Veteran
Points: 52044
Posted by: @jacks_farm

adding more garden lime will take care of the pH level early flower and mid flower

This confused me, I was under the impression that Perlite has an alkaline pH level between 7.0 and 7.5 so to balance an acidity is needed. I’m considering a jaunt into a non coco run so I’ve been trying to pay attention.

Random acts of kindness make the world a better place

ReplyQuote
Posted : December 26, 2020 11:47 pm
Zombie Nation, twisted1, jacks_farm and 5 people liked
TempleGrower
(@templegrower)
Myrcene
100 Likes
250 Likes
500 Likes
1K Likes
Completed Diary
Grow Off Diary
2.5K Likes
Youtube 1K Views
5K Likes
Mentor
Plant of the Month Winner
Complete Grow Off Diary
Canada
Respected Member
Points: 19800

Yeah, pretty sure perlite is inert. It's just cooked obsidian (mainly SiO2) and has a pH itself of around 7.0, but I don't think it contributes to the pH of the medium... I've used it in my soil recipe for years without issue.

That said, it is a non-renewable resource, which isn't the best. If that's something that concerns you of course. Heh.

And definitely don't breathe that dust in. Silicosis is a mafkr.

Life's a garden...dig it - Joe Dirt
Supersoil recipe (by me!) --> https://percysgrowroom.com/organic-super-soil-recipe/

ReplyQuote
Posted : December 27, 2020 12:35 am
Zombie Nation, Hart, monkeydo and 7 people liked
Woolie
(@woolieback)
Linalool
100 Likes
250 Likes
Patreon
500 Likes
1K Likes
Grow Off Diary
Member of the Month
Diary Writer
2.5K Likes
Stoner Movie Club
Wales
5K Likes
Respected Member
Points: 17071

Bro I use a diferent substraight to soil ,coco/ perlite mix , for all the above reasons im moving away from it , and its dust is awful, yep found out the hardway! substuted them for clay pebbles ,, and there is no difference really , not sure if this is helpful bro but can't see why they wouldn't work as well 

Suckin on Diesel

ReplyQuote
Posted : December 27, 2020 8:07 am
Zombie Nation, Hart, Doctor X and 5 people liked
Chillbert
(@chillbert)
Myrcene
100 Likes
250 Likes
500 Likes
Diary Writer
1K Likes
Plant of the Month Winner
2.5K Likes
Patreon
Stoner Movie Club
United Kingdom
5K Likes
Respected Member
Points: 15981

@jacks_farm 40/60 perlite /soil sounds very doable .. plenty of aeration.. the figure that keeps popping up when researching is 30% or 1/3 aeration components in the mix. I’m sure that can be pushed a bit

Time to pop some more beans 😗

ReplyQuote
Posted : December 27, 2020 9:07 am
Zombie Nation, Hart, Doctor X and 4 people liked
 Anonymous

You can grow good green in 100% perlite (Dutch buckets) I have done myself in the past as an experiment. So I don't think it's something you really need to worry about. Esp in a medium like coco say where you are watering a lot more.

If you want to use a more renewable medium, then I'd go for rice hulls. You can most likely pick them up from a local brewer supplies near where you live. They will do the same thing but break down over time. I tend to reuse the same soil over at least four or five grows. If you change your growing medium every grow and dump it in the garden beds say. Then you are kinda defeating the point and just making work for yourself with every grow.

I would avoid using peat in any grows. My own mix right now is about 70-75% coco, 15-20% perlite and around 10% good clean compost I made myself. You could use regular compost from a store. If I did that I would add a small amount from your garden. You only need a table spoon or two. There are more microbes etc in a tea spoonful of good soil than people on the planet.

You can just mix the medium with some from a pot you have already grown in a few times. That way all the microbes and fungi are mixed through all the pots. It will take them a while to re-establish in the pots. But that isn't an issue since I just top dress and grow another plant in the same soil. Plus a lot of things like blood, fish & bone take time to break down anyway. Just top dress and let them sit for a while between grows. Normally some fresh coco, a handful of compost and a few chicken manure pellets broken up into little bits.

 

ReplyQuote
Posted : December 27, 2020 11:03 am
TempleGrower, Zombie Nation, Hart and 5 people liked
Chillbert
(@chillbert)
Myrcene
100 Likes
250 Likes
500 Likes
Diary Writer
1K Likes
Plant of the Month Winner
2.5K Likes
Patreon
Stoner Movie Club
United Kingdom
5K Likes
Respected Member
Points: 15981

@herrodotus450bc nice system bro 👍

Time to pop some more beans 😗

ReplyQuote
Posted : December 27, 2020 11:16 am
Zombie Nation, Hart, Doctor X and 2 people liked
jacks_farm
(@jacks_farm)
Linalool
100 Likes
250 Likes
500 Likes
1K Likes
Diary Writer
2.5K Likes
Known Member
Points: 8358
Posted by: @monkeydo
Posted by: @jacks_farm

adding more garden lime will take care of the pH level early flower and mid flower

This confused me, I was under the impression that Perlite has an alkaline pH level between 7.0 and 7.5 so to balance an acidity is needed. I’m considering a jaunt into a non coco run so I’ve been trying to pay attention.

Sorry monkeydo, should of worded this better.

Adding lots perlite means the plants going to use more water, food and garden lime 

The perlite dust may cause a spike in soils ph level when I first pot the plants up but as the perlite takes a very long time to break down I don't think it's going to have a big impact on the soil ph level

Most soil has a high level of peat moss and the ph level is really low.

Could be overthinking but is a 50/50 mix of perlite/soil treated as hydro or soil mix ?

And how does the extra perlite affect the uptake of nutrients (ph level) ?

 

ReplyQuote
Topic starter Posted : December 27, 2020 11:38 am
twisted1, Zombie Nation, Hart and 3 people liked
 Anonymous

@jacks_farm A lot of the soil which I assume by that you mean compost in bags right? Is most likely a peat mix to begin with in most cases. You should try to avoid peat based composts for grows or garden. What you want is a proper soil based compost, or even better compost you have made yourself from kitchen waste etc.

I don't really get using garden lime since I have never used it on a grow. The only time I have used it was to grow veg outdoors. It's good for things like club root and the like on brassicas (cabbages etc). It seems like something has already gone badly wrong with the soil if you need it for a grow. Nearest I have come is using dolomite chippings same thing you use to dash a wall with. That was more because I had them left over and looked nice as a mulch in the grow.

Like I say my only XP with lime in a gardening sense is using it on Veg beds. That’s in the last half of October, or a week or two before I manure them. Not 100% sure on this so look it up for yourself. But I think I remember something about liming slowing the break down. But then if you are mixing up soil you will be letting it sit for a while before you plant into it anyway so.

Perlite won't affect the nutrients in any meaningful way. It will only affect the drainage and aeration of the medium. It's basically the same as adding coarse sand. The reason we use perlite, rice hulls or vermiculite is that it's a lot of lighter and does as good a job.

ReplyQuote
Posted : December 27, 2020 12:35 pm
twisted1, Zombie Nation, Hart and 4 people liked
 Anonymous

@monkeydo The 100% perlite (Dutch buckets or hempy buckets) aren't that hard to make. Builders bucket and a bag of 1" 2" stones from the local hardware store. Then drill a hole in the side of the bucket about 2" from the base of the bucket. Add enough stones to fill just above the hole you drilled. And fill the rest with perlite.

The hard part is watering them every day early on and again when the plants get big and are drinking a lot more. Watering is easy you just water until you see it coming out the hole that you drilled. Once it starts coming out keep on water for a few seconds. The run off you can use on tomatoes or the like. I f I remember right you're from the southern part of America. So if you have a decent yard you could grow plenty of nice big beef tomatoes with the run off during the summer.

You do need to keep on top of whatever mix you have for your plants. Like any hydro grow you don't really have that buffer there to slow things down. So if there are issues with the nutrients they are going to hit the plants hard and fast. But it's a dirt cheap project for anybody wanting to try their hand at hydro. One bucket in a grow as you pet project kinda thing lol.

ReplyQuote
Posted : December 27, 2020 1:08 pm
twisted1, Zombie Nation, Hart and 5 people liked
jacks_farm
(@jacks_farm)
Linalool
100 Likes
250 Likes
500 Likes
1K Likes
Diary Writer
2.5K Likes
Known Member
Points: 8358

@herrodotus450bc

Thanks loved the video, can you use a 60ltr round tub and mix all the dry food and soil(keep the soil damp), mix it up every week and add say 10% perlite and reuse the old soil from the last grow in the pots a week before potting the plants up, as this would be more practical in my set up, would it give me something between dead soil and living soil ? 

Could the soil be damp before watering or will it still cause root rot ? 

Thinking drying the soil out will kill the living soil

ReplyQuote
Topic starter Posted : December 27, 2020 1:40 pm
Zombie Nation, Hart, Doctor X and 2 people liked
Page 1 / 2

In our cannabis growers forum, we have guides to growing cannabis, cannabis grow dairies that cover growing weed in hydroponics, soil and coco. Find the help you need, by either, using the search box, or asking for help in the forum.

Our cannabis growers website also has competitions where you can win free weed seeds. As a member you will also have discount codes for cannabis seeds, and LED grow Lighting.
Our Cannabis Growers Forum is for educational purposes and we encourage our members to check their country of residence legislation before germinating a marijuana seed.

This site is here because we want to help you grow your own cannabis for personal use. Therefore, any member who is suspected of growing cannabis for commercial gains will be banned immediately.

Please read our forum rules, and enjoy the site.

Percys Grow Room Facebook Page, Cannabis grower forum fb page,
percys grow room twitter icon, cannabis growers forum
pintrest logo percys grow room, cannabis forum
percys grow room instagram logo

Find us on all social networks! Just search for Percys Grow Room