Actually it is not burdock. Burdock is what some people call wild rhubarb (but not edible). All leaves are basal, until it produces a flower stalk. What you have is Velvet Leaf, a common weed in farmer fields. As you see, flowers are not very showy, but the seed pods are good for dried arrangements. I purposely grow a few stalks every couple years. But try not to let too many seeds drop. Plants are easy to pull in the garden. Yes it is a foe, but pretty easily managed. And kids love it! Rick

We grow tons of four o'clocks, but then we have the space for them to grow rampantly and reseed so it isn't a problem that they can be so invasive. I do try my best to keep them outside the fenced veggie garden, though I've let some of them stay in the fenceline. That wasn't my plan, but I'd have to dig so deeply to get them out that it would leave the rabbits and other critters with a big deep spot with soft soil so they could come under the fence, so I'd rather have 4 o'clocks growing in the fenceline than rabbits growing in the garden. I use four o'clocks as a compost crop too. Because mine are in morning sun/afternoon shade, a lot of them get really tall (like 5-6' tall) stretching for the sunlight, and then they get heavy with blooms and start falling over. I go out with the lopping shears and selectively cut back a bunch of them right down to the ground, giving me tons of biomass for the compost piles. They regrow in no time at all. Not only do the hummingbirds love them, but so do all the night-flying moths. I love them too---they are very tough and can survive tremendous heat on low rainfall. Their scent perfumes the whole yard in the evenings. I consider four o'clocks a garden friend. Even my dad, who mostly grew veggies and fruit and didn't plant a lot of flowers, grew 4 o'clocks. If you like to have a nice, neat garden with plants that stay nicely in the spot where you put them, I can see where they could become a garden foe. I am very careful to pull out the 4 billion little four o'clock seedlings that sprout in the spring where I don't want them. Because I've tossed so many big four o'clock plants on compost piles over the years, we now have four o'clocks not just in their original location, but in the three compost piles that are scattered around our place. It is so hard to find plants that tolerate clay soil and very low rainfall in summer, and four o'clocks do both, so I love them. They're also one of the prettiest compost crops I grow.

I cannot be sure just what they are. If they are causing damage to the plants you may need to control them and since yellow sticky traps will attract and capture Whitefly those same traps may do that with these. Maybe an Insecticidal Soap spray will be needed. Some people even report good control of pests in the greenhouse with a handheld vacuum.

Looks like Forsythia to me. If it's young it wouldn't necessarily flower the first couple of springs. Lenticels on the top picture are just right imo. Looking at the leaf axils I think you'll get flowers next spring unless the winter cold is too much for it.