This plant could grow past 6ft tall easily in the right conditions, I would deffinately look for a new set of stakes. The following is an excerpt from an online article about dahlias.
"Once your Dahlia attains sufficient height, secure it loosely to the stake.
I recommend using a length of an old nylon stocking because it will stretch as the plant grows, rather than cutting into the stem, as string will do.
Loop each tie into a figure 8, with the crossed portion between the stem and the stake
to keep stems from rubbing or being choked."
As for cutting the stems at the bottom that is up to you. Just keep in mind what shape you want this plant to grow. Keep trimming and you attain a compact bushy form. Another except from the same article.
"If your goal is to produce massive sized flowers, remove all of the side buds at the end of each branch throughout the growing season. If you want your Dahlia to provide a continuous, extended flower show, you will need to remove the spent buds promptly."
Here is the link to the page.
Dahlias, How to Grow and Care for Dahlia Plants - The Garden Helper - Garden Helper, Gardening Questions and Answers
For best value, a little bit of work should be done to match pot/light/soil/seed conditions. But for ease of interest I would suggest people try and find something that is local to their environment and living condition that can handle it.
With just a few pieces of information I think the brain trust in this thread could help people get some successful combinations with very low effort on the PLANT hater's part, but for 10 seconds a day and a few photos later to document great failure or success. I am hoping that Gerbil and Bungle and any other plant lovers might chime in with their knowledge to get everyone some conditions for success.
I think the only necessary knowledge would be general geography, like West Kansas, or Coastal Georgia and then the direction/hours of direct sunlight the potential windows have.
Worst in show can be a forum title, but it requires evidence and effort.
Which plant thread lurkers will be the first to accept the challenge.
And youre right;That caterpillar looks like it could be a giant swallowtail butterfly but I'm not exactly sure. In any event I would remove it and check the top and bottom of any foliage on the tree and remove any small pearl like eggs you may find. They aren't necessarily harmful in small populations but insects are masters of exponential reproduction so be wary.
Next step is to kill all those fucking weeds. Also slowly removing the grass in my front yard for eventual desert landscaping.
Not house plants, but spring is full on here. Went out and picked a cup full of blackberries this afternoon. Muscadines are already putting out. Trying to decide if I have the energy to do anything with the blackberries other than eat them. I normally make muscadine jelly or have my grandmother do it. Love it to death.