I hope to find a citrus tree that I can keep 10” high and about 6” wide with a long (about 4”) trunk.

I don't think you are going to find a tree with those dimensions. You do mean 10 foot tall and 6 feet wide, not inches right? My recommendation is to pick a variety you like on a dwarf root stock. Four Winds Growers and Harris carries them.

What about a Seedless Kishu or you don't have a lime how about a Key Lime both tree's stay small .

Brian

Or a Fukushu Kumquat? I guess my choice would be a kumquat or Variegated Calamondin.

I too was thinking a kumquat of some type would probably fit the description as they are much less prone to drooping limbs.

Mandarins would be my choice, if you can keep them in that more upright form somehow. Or how about Oroblanco (but it will probably be a chore keeping them small!).

I see that you live in the Bay Area. This is a good place for growing citrus but you have to be careful about which variety you choose. Since we get occasional frosts in most locations, things like a key lime are not a good idea because they are very sensitive to freezing temperatures. Certain citrus, such as grapefruit, are also not a good idea as they need warmer temperatures for the fruit to ripen properly. Personally I have also found that oranges need a bit more heat than we have here. My most successfully citrus varieties in our Bay Area climate, by far, are mandarins. They are, in general, very cold tolerant and they ripen appropriately here. Some varieties to choose from are page, kishu, tango and gold nugget. My personal favorite amongst these has been page. It has an amazing and complex sweet tart flavor although it is important to note that it is not necessary seedless. The others are very tasty as well. Good luck.

-Brett

As brettay wrote above which citrus to grow in the Bay Area does need some selection, as the Bay Area winter temperatures are not warm enough for many varieties. However, a selection from one of the many mandarin or satsuma varieties should do well in your area. Mandarins and satsumas are smaller citrus trees, and should fit your demands as to size. You might want to look for a mandarin or satsuma that ripens early, seedless and easy to peel, there are quite a few that fits this description.

Where in the Bay Area? It makes a difference. Not all citrus are good looking / ornamental.

Please also confirm the dimensions.

Bloomsweet grapefruit is good down to10F

I had discounted Satsuma due to their sprawling and rather unkempt growth habit being not what I consider ornamental, also if not on dwarfing root stock most varieties can grow to too large of proportions after 10 -15 years, more so in width than height reaching sizes of 12-15 feet wide and 8-10 ft tall within a decade. But upon further thought there may be varieties that tend towards smaller stature that might be considered such as Miho Satsuma and perhaps Seto.

Guys, thank you very much for your ideas!

I live in Contra Costa County (East side) of Bay Area now which is more Sacramento than Bay Area climate-wise. I moved to here from San Jose last spring.

I decided not buy a tree online since I wanted to see it before I got it, so I went to several local nurseries and also to Lowe's and HD. They had mostly small 1.5' ones from Menlo or Four Winds. I was looking primarily for mandarins but I found only two premium sized Page mandarin trees on a standard rootstock. I was hoping for a semi-dwarf one.

I talked with an owner at one of the nurseries and he recommended me to go with a plum tree. So, I purchased a 5' semi-dwarf Catalina Plum tree from Dave Wilson Nursery.

Not a citrus one but I think I got a nice looking tree and I like plums too :)

Thank you very much again!

I expect that you will be very happy with your plum tree. As FYI, the deer eat every leaf they can reach on my plum tree. And the birds and squirrels are relentless. Protect your young tree! Good luck

You may want to reconsider the plum tree. It looses it's leaves in the winter. Citrus, avocados, and some other trees are evergreens. I have a cherry plum tree in the front yard. The red leaves is stunning in the spring and summer, come late fall..our street is littered with red leaves. Most plums also need another plum tree to set fruit. As far as the citrus being small, it will grow to a decent size by the third year.

junk4us, our street has only deciduous trees including cherry plums, so one more real plum tree won't change anything :)

Catalina plum is self-fruitful. Yes, it will do better when planted with pollenizers like Santa Rosa but it is not necessary for this one.

I think you have done well to select a plum. My Mother once planted a Meyer lemon in her front yard... she never got a single lemon from that tree; but the neighborhood enjoyed them.