# How to raise soil ph?

**URL:** <https://ilgmforum.com/t/how-to-raise-soil-ph/60502>\
**Category:** Grow Cycle\
**Created:** [December 31, 2020, 3:16am UTC](https://ilgmforum.com/t/how-to-raise-soil-ph/60502 "2020-12-31T03:16:26Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Huganug](https://avatars.discourse-cdn.com/v4/letter/h/ea666f/32.png) [@Huganug](https://ilgmforum.com/u/Huganug)\
**Post date:** [December 31, 2020, 3:16am UTC](https://ilgmforum.com/t/how-to-raise-soil-ph/60502/1 "2020-12-31T03:16:26Z")

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I have consistently been watering 6.1 ph since beginning of grow. Plants just entered week 5 of flowering (Strain flowers in 8-9 weeks). I recently noticed runoff ph was 5.9 so I increased the ph of water going in to 6.3. Runoff is still rapidly going down, it is now 5.4 ph. Should I use dolomite lime to increase ph?

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**Author:** ![JaneQP](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/janeqp/32/555131_2.png) [@JaneQP](https://ilgmforum.com/u/JaneQP)\
**Post date:** [December 31, 2020, 4:11am UTC](https://ilgmforum.com/t/how-to-raise-soil-ph/60502/2 "2020-12-31T04:11:08Z")

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@Huganug. I was just looking for a calcium source tonight and while I was searching there were different limes. Some raised pH and some did not.

I am no expert but there are many friendly and talented growers her that are certain to jump in and help.

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**Author:** ![dbrn32](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/dbrn32/32/533801_2.png) [@dbrn32](https://ilgmforum.com/u/dbrn32)\
**Post date:** [December 31, 2020, 7:29am UTC](https://ilgmforum.com/t/how-to-raise-soil-ph/60502/3 "2020-12-31T07:29:13Z")

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Dolomite lime or agricultural lime. The more finely its ground the faster it will react. You’ll want about 1 tbsp per pot size gallon. Then gently work into top of soil.

Don’t use more than I suggested. It can cause bigger problem and could potentially turn top of your pot into concrete.

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**Author:** ![fast-grow](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/fast-grow/32/392039_2.png) [@fast-grow](https://ilgmforum.com/u/fast-grow)\
**Post date:** [December 31, 2020, 1:42pm UTC](https://ilgmforum.com/t/how-to-raise-soil-ph/60502/4 "2020-12-31T13:42:06Z")

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What brand soil are you using? Soil made for cannabis is PH buffered but most garden soil is not buffered for cannabis.  
I had a batch of happy frog that crashed the PH down to 4.5 and found out it was an old bag from Amazon. The FFHF from the local grow store kept good PH.  
My current grow I am using recycled soil and one of my amendments that I use is dolomite lime. PH in is 6.5 and out is 6.4.

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**Author:** ![Huganug](https://avatars.discourse-cdn.com/v4/letter/h/ea666f/32.png) [@Huganug](https://ilgmforum.com/u/Huganug)\
**Post date:** [December 31, 2020, 2:29pm UTC](https://ilgmforum.com/t/how-to-raise-soil-ph/60502/5 "2020-12-31T14:29:09Z")

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Thanks! I think I’ll order some and try that.

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**Author:** ![Huganug](https://avatars.discourse-cdn.com/v4/letter/h/ea666f/32.png) [@Huganug](https://ilgmforum.com/u/Huganug)\
**Post date:** [December 31, 2020, 2:33pm UTC](https://ilgmforum.com/t/how-to-raise-soil-ph/60502/6 "2020-12-31T14:33:21Z")

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The soil is fox farm ocean forest. But I couldn’t find it locally so I did have to order off Amazon so I don’t know how fresh it was. I plan to get FFHF from our local feed store for my next grow. I think I’ll try a little bit of dolomite lime mixed in this time around and hopefully it isn’t an issue in the future with FFHF soil.