Help! Am I using the right soil?

ellenjean12May 5, 2014

Hi all (I'm a newbie here so please forgive me if I'm asking a stupid question).

We just built two 3.5 x 3.5 raised beds and I sent my husband to pick up soil from a place called Sloat here in SF. He came back with their potting soil (ingredients: fir bark, peat moss, horticultural sand, mushroom compost) and he's emptied most of the bags into the raised beds already. Is this stuff similar to Mel's mix? What should I add to it to make it better? Thanks for your input. I'm looking forward to learning from all of you.

Thank you for reporting this comment. Undo

It is difficult to say since we can't see what is on the bag.
Does it mention that it is good for raised beds?

A blend of a good quality potting mix and compost (50-50)
is good. Too much peat moss will make the mix acidic.
If you aren't sure you can always add a little more compost. More than one type of compost is recommended. You have mushroom compost already.

It does sound like a good mix if the proportions are correct.

    Bookmark   May 5, 2014 at 5:31PM
Thank you for reporting this comment. Undo
yolos - z 7b/8a Ga.

No it is nothing like Mel's Mix. Mel's Mix is 1/3 vermiculite or perilite, 1/3 peat moss, 1/3 compost that is made from 5 different types of compost. The mix your husband purchased has some peat moss in it but we don't know how much. It only has one type of compost. If you want it to be more like Mel's Mix, add vermiculite/perilite and some different types of compost. I'm not saying your soil will not work but you asked if it was like Mel's Mix and it is not. The fir bark may work similar to vermiculite but I don't really know.

    Bookmark   May 6, 2014 at 10:20PM
Thank you for reporting this comment. Undo

I would add coarse vermiculite (I had to go to a nursery to find this... big box stores don't carry it or it is in TINY bags) and maybe some extra compost varieties. You could then do a pH test (kits available at any hardware store or nursery) and if it is alkali, you could ass sphagnum peat moss. That would get you closer than the current mix.... and thanks for making me feel better to micromanage my hubby and buy the soil myself, lol!! I figured he would do something like this, too, hahaha! :)

    Bookmark   May 12, 2014 at 3:16AM
Thank you for reporting this comment. Undo
planterjeff(7b Grant Park Atlanta)

I second the vermiculite additions as it will only help with water retention. I would stay away from perlite as Mel and many reviewers on this site will tell you it is worthless. I did my first sfg with a potting mix just like you are describing and it did fine. This was before I had even heard of sfg and I had not read the book so I didn't know any difference. Anyway, the potting mix you are mentioning sounds like a pretty good mix. In fact from what i understand, Mel's mix once incorporated the use of sand a good drainage additive. I suspect that the sand was added to this mix to prevent compaction and all that. The "forest material" is a standard additive to most organic potting mixes and helps keep it aerated and adds organic matter as it breaks down. It sounds like the mix is already balanced. Adding a bag of black cow would probably help with extra nutrients. Does it say "feeds for 3 months" or something like that on it? if so, it probably already has time release fert in it, so you will not necessarily need to amend with compost.

    Bookmark   May 12, 2014 at 10:01AM
Thank you for reporting this comment. Undo

Potting mixes are usually bark, peat, and perlite. Add some compost, and it'll be fine, as potting mixes usually drain quite a bit faster than garden mixes.

I wouldn't add vermiculite, as my experience is that it turns into mush once it gets wet a bunch and isn't a useful addition.

    Bookmark   May 12, 2014 at 4:34PM
Thank you for reporting this comment. Undo
planterjeff(7b Grant Park Atlanta)

That's funny what you are saying about vermiculite JoppaRich. I never had an issue with it turning to mush, although it does act like a sponge. Just make sure you are using coarse ground.

    Bookmark   May 13, 2014 at 10:20AM
Sign Up to comment
More Discussions
Bush bean spacing
I was reading in the Sq. foot gardening book that the...
What should I use to fill my raised beds?
I'm going to be making some raised beds in my backyard...
Mighty Matos / Mighty Veggies and SFG
Does anyone here have experience with SFG and Mighty...
Corn in sfg-how deep do roots need to grow?
My sfg is only 4x4. I plan this season, only using...
Filling my raised bed
Ok, I'm new to gardening but am planning on constructing...
Matt Cauwels
Sponsored Products
Sethos Old Iron/Recycled Glass Nine-Light Chandelier
Croquet Club Outdoor Side Table, Patio Furniture
$465.00 | FRONTGATE
Orange 14-Oz. Mug - Set of Four
$19.99 | zulily
44" Encoreā„¢ Possini Euro Silver Hugger Ceiling Fan
Euro Style Lighting
Canterbury Hudson Counter Height Table in Merlot Cherry
Beyond Stores
Calligaris | Parentesi Table - Quick Ship
Nimah Wall Sconce by Eurofase
$238.00 | Lumens
Drifted Slope Chair in Orange
$134.99 | Dot & Bo
© 2015 Houzz Inc. Houzz® The new way to design your home™