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'soil' dries out too fast

Posted by kawaiineko_gardener 5a (jesusbeloved29@yahoo.com) on
Sun, Mar 18, 12 at 17:47

NOTE: The lime called for is normal, run-of-the-mill garden lime, NOT fast acting lime.

I call it 'soil' because it's not like dirt in the ground. It's a soil less mixture used in container gardening. Although it IS for container gardening my question is about the soil mix itself not advice on container gardening.

Below is the soil less mix I use; it's a big batch and it yields about 30 gallons per batch. I find that it dries out very quickly. I am aware that part of the problem is that it's because it's in a container and any soil will dry out faster in a container, it just goes with the territory of container gardening.

However I also know it's just in the nature of the soil mixture itself (in regards to the 'recipe' posted below). It's been designed to absorb moisture so that the plants don't get wet feet, and/or so you don't over water.

This is more of a hindrance then a help in the summer, and the problem is compounded with container gardening.

I was wondering if I should replace part of the ingredients
with something that will keep it wet longer so it won't dry out so fast. I don't want it so wet the plants will be water logged.

However I also don't want to be bone dry that I'm having to water at the drop of a hat, which is currently the problem.


2-3 cu ft pine bark fines
5 gallons peat
5 gallons perlite
2 cups dolomitic (garden) lime (or gypsum in some cases)
2 cups CRF (if preferred)
1/2 cup micro-nutrient powder (or other source of the minors - provided in some fertilizers)


Follow-Up Postings:

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RE: 'soil' dries out too fast

If moisture retention is insufficient, then you should seriously consider replacing much of that perlite with vermiculite. Vermiculite is better at retaining moisture than perlite.

There are also these "water beads" that you can add to containers, but I *only* use them in really small containers to even things out between waterings.

Almost all of my containers have built-in water wicks. They have a water reservoir in the bottom, with a fabric wick that draws water up from the bottom. This helps quite a bit.


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RE: 'soil' dries out too fast

IMO, there's WAY too much perlite in the mix. I'm not sure how many gallons 2-3 cu ft of the pine bark fines add up to, but my sense is there's too much of that also. The following mixture works well for me (good drainage, but no need to water constantly): 4 parts spaghnum peat or Pro-Mix with micros; 3 parts my own screened compost; 2 parts shredded pine bark fines; 1 part perlite (plus add-ins such as dolomitic lime, some slow-release ferts, as necessary. I also put a couple of sheets of newspaper over the bottom holes and tucked around the plant (tomato, e.g.) at the top, to help hold the moisture.


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RE: 'soil' dries out too fast

I'd eschew the vermiculite, which simply turns to mush, and add more peat moss.

I far prefer a fast draining potting mix and my favorite is mostly bark. I have no problem watering thoroughly once a day, or even twice if necessary. Are you watering the heck out of your plants when you water or just offering a sip?


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