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I have bought Dahlia tubers from a big box hardware store. According to the packages there are 3 plants per package.

Each package contained 1 clump that was about fist sized and two smaller clumps (size of the smaller clumps varied wildly).

I bought 3 packages: Blue Boy, Thomas Eddison and Arabian Night.

I have some pots that are 30 cm wide and 25 cm high (around 12 inches wide and 10 inches high in the imperial system).

I've read that I should plant these indoors 4-6 weeks before the last frost date which is about now.

Considering I want to maximize the number of tubers per pot, how many per pot can I realistically plant.

Gilles
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2 Answers2

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According to almanac.com you should plant them 9-12" apart. Your pots are 12" wide so I would only do one per pot, with the intention that your keeping them in the pot through-out the growing season. Doing more than one will cause the plants to choke each other out as the roots grow taking more and more room in the pot.

If you are going to transplant them out of the pot I son't see why your couldn't do two or three of them, just don't leave them like that forever or they will die for lack of room in the long run.

Another thing as well if you keep one in a pot through-out the growing season is making sure they are fertilized every so often. They will eventually run out of nutrients and will need new soil or something added.

Ljk2000
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Giles, do you have freezing temperatures during the winter? The most vulnerable part of any plant are the roots. Plants in pots absolutely need to be kept where their soil will not freeze.

If this is the case, like all Dahlia owners and growers, you will be bringing your pots inside, removing the tubers, storing them in sawdust and or newspaper in the dark and in an unheated garage (stays 40 to 50 degrees Fahrenheit). You will then be able to repot in the spring, in potting soil only.

I would plant no more than 3 bulbs in 12 "...2 smaller dahlia 1 big one? I would definitely find super 'filler' or 'framing' plants to insert. Low plants that cover the soil, vines to drape over the sides. Here is one of my favorites; Orange Sedge, Ipomea in lime and Dahlias. Breathtaking combination. Do you have room for a 32" pot, 18" pot and a 12" maybe 4 or 5 6" pots of orange sedge arranged at the bottom of the 18" pot? Turn a pot upside down to raise a few pots?

I would use Osmocote 14-14-14, half the recommended amount. Simple, sterilized potting soil without added fertilizer or water holding gimmicks.

Find pots that are 'related' by color, form, material. Not the same pot different sizes but that works too. You want the plants to be the focus.

stormy
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