New to Dahlias and tubers. Please help!

califox(9)April 18, 2013

Hi there,

I am new to planting dahlias and tubers in general but want to have a go at it. I originally thought I would start my tubers in pots but have seen some forums that make me doubt whether or not this will work. I have one small spot where I could put them in the ground but I am fighting off ivy in the area and not sure how this would work. I really not even know how to prepare soil for this kind of gardening.

Anybody have success in pots? If so, how big of pots and how many tubers per pot?

Any advice whatsoever would be much appreciated.

PS. i am in zone 9, northern california

Thank you for reporting this comment. Undo

Growing dahlias in pots can be very frustrating as they require so much attention. Plants in the ground do not need to be watered every day and sometimes twice per day as do dahlias in pots. Smaller varieties do ok in pots and the pot needs to be at least 5 gallons. Tree pots of 30 or more gallon size work best. A pot buried part way into the ground is an excellent solution. The pot can be much smaller and even gallon sized pots work well. One commercial cut flower grower in Northern California grows all his very many dahlias in partially buried pots.

    Bookmark   April 19, 2013 at 12:44PM
Thank you for reporting this comment. Undo


I live in San Francisco and have about 15 dahlias in different sized pots. So they can grow well in pots but Ted is correct - it takes more work AND by far the most important thing is size of the pot and soil.

Firstly, only one tuber per pot unless you have a huge 14 inch pot and want to try growing a low dahlias (3') IN FRONT of a larger dahlia (4 1/2 -5 '), which I have done with success. Assuming you only have 1 to a pot, my advice is make the pot as large as possible (at least 8" and preferably 10-12") and use a combo of potting soil and regular garden soil.

The next main thing is DO NOT Water until they sprout and show about 4-6 inches of sprout. Expect first year dahlias to maybe show reluctance to growing. I've found 2nd and 3rd year dahlias do much better than they did in their first year.

Some people advocate moving the pot around according to heat or cold and amount of sun. I am not a fan of that myself - I have some growing in SHADE for the most part and they 'took' just fine. I also found they adapt to their conditions and moving them around never gives them the opportunity to establish a sun pattern they can grow into. but this is your choice - again, many people say move them from one area to another so I assume they also get good results.

Good luck.

    Bookmark   April 19, 2013 at 8:26PM
Thank you for reporting this comment. Undo

Thanks so much for the tips; both responses are incredibly helpful. I originally was going to grow in pots but it seems I may try in the ground instead now. Any advice on preparing the soil? I know good drainage is super important with bulbs and the like. Thanks again!

    Bookmark   April 20, 2013 at 1:50AM
Thank you for reporting this comment. Undo
Noni Morrison

How acid is your soil? Unless your soil is over into the basic range, dahlias like a bit of lime added as well as good compost. I like to add organic tomato or veiatable fertilizer when I plant them. Put in a post or stick for them to be tied to, when you plant and while you know where the tuber is so you don't spear it later.

    Bookmark   April 20, 2013 at 4:56PM
Thank you for reporting this comment. Undo

I am zone 14 in Sacramento and have grown them for years. So our climate is similar. I would dissuade you from growing in pots because it's too hot here and the plants prefer to be in the ground where it is cooler. I do start my tubers in pots in the spring before I transplant to the garden soil. Another advantage of this strategy is that the tender sprouts are protected from slugs & snails when they are most vulnerable. I transplant when they are about 8-12" tall and they are less tasty to slugs & snails.

I have grown some in pots but generally I believe they are only marginal in pots here in this climate.

    Bookmark   April 21, 2013 at 6:59PM
Thank you for reporting this comment. Undo

If you want to get some 4 to 6 inch cow pots, you could pot them up now and plant pot an all when it gets warmer n the ground.

    Bookmark   April 23, 2013 at 2:11PM
Sign Up to comment
More Discussions
new to dalias, looking for short varieties
Looking to try growing dahlias on my balcony. I'd like...
When will this winter ever be over?
Can't wait for the better weather to come so I can...
Paul Reeder
Starting dahlias in miracle grow potting soil
Hello,,,I need some help in getting my dahlias started...I...
Seeds or Tubers? Info needed.
So I am new to gardening in general and I am interested...
large booms
I would like to kmow a variyey which will produce a...
Sponsored Products
Foscarini | Maki Linear Multipoint Pendant
Bamboo Cinnamon Wall Sconce
$184.99 | Bellacor
World Imports Pendants & Hanging Fixtures North Hampton 3-Light Outdoor Old
$79.38 | Home Depot
Ceramic Gingerbread Plate - Set of Three
$13.99 | zulily
Old Havana Floor Fan by Fanimation Fans
$1,496.75 | Lumens
Linon Corfu Geometric Kids/Area Rug - RUG-CU0123
$26.00 | Hayneedle
Prism Graphite One-Light Oval Wall Sconce with Plated Smoked Crystal Glass
$264.00 | Bellacor
Lace Pattern Ceiling Medallion
$275.00 | Horchow
© 2015 Houzz Inc. Houzz® The new way to design your home™