It appears to be a yellow oleander (Thevetia peruviana).

Hard to tell without seeing a blossom.

If it is Thevetia, it can grow into a very large shrub if grown in the ground. I've had one in the corner of my lot for 30+ years. Every 5 years or so I just cut it down to a stump and let it grow back. It is mildly frost tender. But grows back quickly once it warms up.

It can also be pruned to grow more of a tree form. Its a close relative of the regular oleander.

I just looked it up. Man, I WISH the flowers on it looked like that but, no, lol. Thanks anyway, Ryan :)
ANy more ideas, Ryan?
ANyone?

I had a pic of the blooms from last year, but I can't find it.

If you want one, let me know. I have both the peach and the yellow ;-) They're both seriously taller than my house. And in late spring, you can't see green for all the flowers. The yellow is more dominant and aggressive than the peach, but they're both strong growers.

OMaGosh..I would love it Ryan!! Gonna shoot ya an email... thank you! :)

Daniella, isn't this the purple wallflower, Wallflower
Erysimum? The leaves on your plant are sort of leggy, but I've seen wallflower plants that look similar to your.

El, no someone on the Name that plant forum suggested the same thing, but nope, not it..blooms dont match up. Thanks tho! I googled for 'Erysimum yellow' as well, since my blooms are yellow..but the flowers just arent right. I wish I could explain them..or find that dang picture!
It's weird cuz it only has leaves at the tops, as more grow in, the older leaves at the bottom of each "head" die off. The biggest 'heads' are about maybe 3" big explosions of leaves. This year I see alot of new 'heads' coming out of the nodes on the naked lower stems.
Since I have no clue what it is, I don't want to prune it or anything..I might kill the whole thing, and its funky, I like it. Reminds me of something you'd see in a Dr. Seuss book. We had really hard rains all day today, so it was pretty beat down when I took the pic in between downpours and thunder. I tried to rig it & stake up the 2 floppy pieces real quick just to take the pic.
O man, its 62 outside right now..unbelievably warm for this time of night, this time of year..I just had to say that, lol. I LOVE it!

Guess we will just have to wait for the bloom and hopefully i.d. it then. I also thought of lion's tail from a plant that was outside at my job, but then my own lion's tail plant has a different leaf-type.

O El, none of my Lion's Tail seeds you shared with me have germinated. Do they normally take a long time? It's been 2 months, lol. I used jiffy pellets in the jiffy dome GH thingy. I did some seeds on the surface, some under..all have had bottom heat during the day of 75-80, & room temp at night..lights overhead. Haven't dried out. I wonder if they needed stratification? I wonder if they mushed by now? I should poke around in one of the pellets and see..

As for my Dr. Seuss lookin lil guy..I guess the mystery remains for now..I hope I remember to take a pic when it blooms!
I'm tellin ya this plant puts up with being severely neglected. I always forget about it where it is. Last year I didnt even notice it was blooming till it was just about done..saw the last 2 flowers, they are small. I don't know how I don't pay more attention that thing..the pot is right by the hose spigot! Year round, for 4 years! Maybe I'll move it..

Daniella, I am so sorry your Lion's Tail seeds haven't germinated. Other than googling to find out how to sow these seeds or how long it takes, I wouldn't be able to tell you. I have never planted the seeds before. If you like, I'll try to find out if rooting a cutting is possible and send you that. Here are a couple of pix of my plant now flowering:
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