Roses happy in 511...but

rexedwardfairy(Zone 11)October 16, 2012

Hi Container Gardening Forum (and maybe even Al himself if I'm lucky).

Last winter (In Aus, so July), I transplanted half my roses (7) from potting mix in containers to Al's 511 in containers. I live in the subtropics, 15m from the beach (so there's no way i"m gonna try grow roses in the ground - containers it is). Both sets of roses (those in 511) and those in potting soil mix are very happy. The potting soil mix roses are happy now that i've fed them worm compost. I'm wondering if I can also feed my roses in 511 with the compost (solid matter I'm talking) or would that actually mess with the textural component of what works so well with the 511 - allowing the roots to breathe...? ie if i suddenly throw solid-compost into the mix, its sorta like throwing in dirt - and changing the entire composition of 511 itself. Any thoughts anyone?

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greenman28 NorCal 7b/8a

Yes, you are correct: adding fine-textured compost will change the drainage and retention
properties of the mix. I would recommend a liquid or slow-release fertilizer for the containers.


    Bookmark   October 17, 2012 at 10:54AM
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nil13(z21 L.A., CA (Mt. Washington))

I save my compost for my garden.

    Bookmark   October 17, 2012 at 11:18AM
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rexedwardfairy(Zone 11)

Thanks nil13 and Josh.

Yes Josh, that's what the roses in 511 have been getting so far (liquid seasol plus organic slow-release alternating with chemical slow-release) and they're quite happy.
Thanks for confirming that adding compost would upset the 511 mix.

I'll just keep the compost for the roses (and my other plants) that are still in traditional potting mix.

    Bookmark   October 22, 2012 at 3:37AM
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Yup I agree. I use both slow release and soluble fertilizer for my container plants.

    Bookmark   October 22, 2012 at 11:31AM
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