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| Al (or anyone with experience here?) I saw in a few very old posts that you suggested a 3-1-1 mix for SWC like the Earthbox or Earthtainer.
I've become quite comfortable making and using the 5-1-1 (thanks for all the help there, I have maybe 60 containers using 5-1-1 very well right now) - but I haven't tried any SWCs yet. I made up a batch of 3-1-1 with 1 cup of lime (the usual rate for my batch size). My question is this: the Earthbox instructions say to take whatever potting mix we buy and add a large bag of (included) lime to it. Do you think this is necessary given that I've already added the usual amount? I understand that you might not be an earthbox expert but can you see any reason why I might need more lime in this situation? Or do we think they are just assuming that most potting mixes do not include lime? They also include a bag of fertilizer that they suggest we use in a "strip." I will probably use the strip in at least one earthbox to see how it goes - but can you see any reason why I shouldn't add my usual light dose of FP once or twice a week? Might it not work as well in an SWC/wicking situation? Thanks! |
Follow-Up Postings:
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- Posted by rnewste 8b NorCal (rnewstead@aol.com) on Tue, May 17, 11 at 22:52
| red, I would follow the EarthBox instructions for that product faithfully. They have done a lot of research on the Lime and Fertilizer amounts and placement within their product. Regarding the EarthTainer, I did trials with over 30 combinations of ingredients and I found for most vegetables, I got the best results with a 3:2:1 ratio of Potting Mix, Microbark, and Perlite. Keep in mind that the wicking requirements for the SWC to operate properly (without any top-watering) require a higher amount of peat versus traditional containers where the 5:1:1 mix works well. Raybo |
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- Posted by redshirtcat 6a MO StL (My Page) on Tue, May 17, 11 at 23:58
| Thanks Raybo! I didn't realize you were on this forum. I haven't paid much attention to SWCs until recently. As soon as I pickup the netpots tomorrow I will be building my first 2 Earthtainers in addition to the 2 earthboxes I'm trying. I will use the 3:2:1 in one of them as you suggest (with Pro Mix BX). The Pro Mix is 85% peat which means that when mixed as you suggest the overall ratio should be something like: So if I want to build my own in the future it's something like 4:3:2 (peat, pine bark, perlite)? |
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- Posted by rnewste 8b NorCal (rnewstead@aol.com) on Wed, May 18, 11 at 0:30
| red, As Pro-Mix BX contains approx 14% Perlite as opposed to very little in Miracle-Gro, I would go with a 3:2:0.75 combo Mix, backing off a bit on adding new Perlite. This should give you a pretty good Combo Mix. I use Sunshine Mix #4 myself as it is much cheaper than the equally good Pro-Mix, and use this recommended ratio. Raybo |
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