How did the ph get so high

I planted in soil with ph of 6-6.5 and watered with mineral water of ph 4. Added some ferts and it's now 4/5 weeks. Now the ph is 7.5-8.0. How does that work?

I'm thinking of transplanting them again, whats the best soil to use to have a stable ph? Seen some coco soil (said coco but felt like a soil !?) in a local garden centre. I live in Spain and it's hard to get things especially if you do not know enough Spanish!!!

What about soil for cactus, there is a lot of that here?

Any advice will be appreciated.

as your plants feed and expell their wastes your PH will rise.
This is true in all types of growing, aero, hydro and soil.
Im sure your growing medium is fine, just make sure to stay on top of the soil PH and adjust as needed.

Good Luck

Also, i wouldnt recommend transplanting unless your plants need a bigger pot. as that will will do more damage now, than a slightly high PH

I'm with Luck. Even If you planted one week ago your Ph could have changed, but there is no reason to transplant just because your Ph changed. It should be checked regularly to maintain it. Only transplant if you need a bigger pot. Ph can change by adding nutrients & should be checked often.

I planted in soil with ph of 6-6.5 and watered with mineral water of ph 4. Added some ferts and it's now 4/5 weeks. Now the ph is 7.5-8.0. How does that work?

Mineral Water has minerals added which raises the ph. Baking soda is ph 8. Mineral Water has a ph of 7.4 Orange juice has a ph of 4.
The real advice here is to test your soil regularly and write it down in a log. And learn ways to control your ph other than transplanting.

The Pot Engineer

is there any soil type medium that is Ph nutral orbalanced? I use hydrton in my hydro byt need soil for the mothers

is there a soil or soil type that is Ph nutral or balanced? whats the best way to lower the Ph, is it just water with a low Ph feed? if it at 7.0 and i want 6.0 would i water with 5.0?