Yes,
@Phaedra Geiermann 
.
I used to have
more dahlias and, perhaps, some additional trouble keeping the tubers through the winter. (Sympathize
@seedcorn )
I would put some Cosmos seed in the ground early. When a dahlia failed to emerge, I would
fill in the bed with a cosmos. They would grow to about the same height and would compliment the dahlias growing around them.
Steve
Hi Steve, you remind me about something I might screw up this year.
Yes, it's also about Dahlias. Last year was my first year to plant Dahlias seriously, and I also tried to lift most of the tubers, clean, dry, and then store them. It's like a gardening academy, and I pick one or two plants to learn about every year.
Ok, Dahlias - till the end of autumn, I became lazier to keep lifting the tubers up. I thought, well, maybe some will successfully survive if the winter is luckily not too harsh.
The spring arrived. I tried to dig out some of the tubers, and they were dead. The frost and snow fully destroyed them.
I thought, well, lessons learned - I should always lift Dahlia tubers; after all, I live in a place where the winter might be too harsh for them.
With a bit of sorry and regret in mind, I transplanted corns and tomatoes to fill those beds. We have to move forward.
Then summer arrived, and the corns and tomatoes grew up happily. BUT, day after day, more and more Dahlias are greeting me.
Uhh, I have no idea what to do now - I pinched all Dahlias to stop their crazy growth temporarily. But eventually, they will become the monsters they should be.
So far, I can only ensure they have enough water. For the tomato/Dahlia bed, I don't worry about the nutrients too much as most of the 500Liter compost/soil I put in the raised beds has a certain (good) amount of chicken manure and all kinds of green/brown wastes from the garden.
Although it shows no sign yet of the nutrition deficiency, this bed might need extra feed soon, as it's a single-layer raised bed, about 250 Liter only.