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mimsyborogrove

Fertilizing for a Supersized Container

16 years ago

I am getting ready to prepare my very first perennial container garden and because I'm a fool who rushes in, I'm thinking BIG!. I have an area that I want to decorate with a few v. large pots (one is the biggest Home Depot sells, I'm guessing about 50 gallons, others maybe 25 gal). That big one I want to plant with an upright evergreen tho I'm not yet sure what kind exactly (advice welcome). I've been reading the many very helpful posts about soil mixes, root pruning, and fertilizing in this forum and I have deduced that Al's Gritty Mix is what I need, since I want the soil to last a few seasons. If I'm following what Al has to say, regular low dose applications of fertilizer are extremely important with this mix, and he recommends daily watering with diluted fertilizer mixed in. And he recommends plentiful watering with (I think I read) about 15% of the water flowing back out of the pot. Which means, with my ginourmous pots, I'll be filling up my 2 gallon watering can with water and a little fertilizer about 50 times for one daily watering session. I appreciate what's been said about the needs of the plant v. the convenience of the gardener, but geez! This may be a little more than I can handle. Are there any shortcuts I can take without imperiling my expensive plants? Would the 5-1-1 mix be an adequate substitute given the size of the pot? Am I correct that the 5-1-1 doesn't need either watering or fertilizing quite as often? Or suppose I replace the soil in the pot the plant is sold in with one of Al's mixes, replant in back into that pot and then prop that up in the huge pot with a little disguising mulch on top; would that work?

Thanks for all the effort that has gone in to all of this forum's posts so far, I hope I'm right that this particular issue hasn't been addressed yet.

Barbara

Comments (2)

  • 16 years ago

    Hi, Barb. You were very kind in what you said. Thank you. Let me put your mind at ease right off the bat - You won't need to water and fertilize containers that large every day unless they're really mature & jammed full of roots, in which case you should get after the roots so you don't need to water every day. ;o) I often need to water my bonsai and some of my smaller packed-tight display containers daily, but a lot of my containers go 2 days or more between watering. Fertilizing duties every weekend or every other weekend are going to keep your plantings very happy, too. Feel better? ;o)

    Tell me about the light you have and what kind of texture or branching habit you want for your evergreen & I can probably offer suggestions. I do have a few in containers (like 100+) ;o)

    Al

  • 16 years ago

    Yes, Al, that does make me feel a lot better. I can do this! Today, I'll go questing for the elusive gran-i-grit:)

    Thank you for your prompt response; are you really only one person?

    My site is against a west-facing wall, entirely under the house eve. It is in full shade till about 1 or 2 in the afternoon (earlier in mid summer) and then full sun till sunset. It's protected from wind. I want a tall, narrow profile for the plant, like a small christmas tree. I'm limited by the one story eave for height; I'd like to be able to prune it to stay at 6' and about 24" diameter at the base.

    I have a couple more questions about your 1-1-1 mix. I'll add them to this thread; let me know if I'm supposed to put them in a new thread and I'll do that.

    One, a theoretical question: I've read you to say that the alkalinity/acidity of the soil mix is not important, just that of the water. In that case, why add lime to the mix at all, even for non-acid tolerant plants?

    Two, a practical question: what exactly does in mean to "screen" bark fines? Force it thru a mesh, I'm guessing, but what size mesh and where can it be obtained?

    Thanks for helping out a novice!

    Barbara