Do they have flowers and when can I repot to larger pot?
Grown outdoors, they do flower in October. However, unless you can give a potted plant an extreme level of light (a solarium, or summers outdoors) you're unlikely to see them. This article has some information you might find interesting. http://www.clemson.edu/extension/hgic/plants/landscape/shrubs/hgic1088.html
Repotting is a topic without a lot of agreement. Some people advise repotting every year, some every 2 years, some only when necessary. Some people recommend repotting only in early summer, just before the plant goes into its major growth cycle. Others find repotting at any time is successful. The pertinent questions about repotting are how large a pot, what kind of soil, and does the plant really need repotting. This article will get you started on answering those questions: https://www.gardeningknowhow.com/houseplants/hpgen/learn-more-about-repotting-houseplants.htm
If planted in the ground outdoors up against house, can it withstand some frost? Thanks!
Hardy to zones 8 thru 11, it will not survive in temperatures below freezing.
https://www.gardeningknowhow.com/houseplants/aralia-plants/japanese-aralia-care.htm
My fatsia is wilting just on one side.
Your plant may be getting uneven water.
If this is potted, make sure your watering the entire pot.
https://www.gardeningknowhow.com/houseplants/aralia-plants/japanese-aralia-care.htm
I live in a condo where a tree/bush is growing. It seems very sad and not cared for the right way by the gardeners hired by the strata. I believe it is a Fatsia Japonica, which I read about on your website. I'm not sure if it's absolutely the same tree/bush or not and was wondering if you could help. I'd like the plant to look nice and healthy so I'd like to pass some information onto the gardeners.
Here is a link with more information and some of the different varieties of this plant.
https://www.gardeningknowhow.com/houseplants/aralia-plants/aralia-plant-information.htm
You could take a leaf sample to your local County Extension Office.
They may be able to help you correctly identify the plant and assist with proper care for your growing zone.
This link will help you locate your nearest office.
I repotted several houseplants with a mixture of topsoil and compost. Within a few days the leaves of one (fatsia japonica) turned brown and fell off. The other - a white flag plant - is showing the same signs of distress. I'm not sure if it's because the plant got too much water (I put them outside in the rain after repotting) OR if the soil had too much compost and the plants are now over fertilized. What can I add to amend the soil? Would sprinkling on a little lime help? Is there something I can do besides repotting again. I don't have another mix of soil.
You definitely don't want to put rick soil in these. And they, more than likely, received too much rain as well. Unfortunately, your only option may be repotting in a mis of potting soil, and only 1/3 of this should be a mix of compost. 2 parts soil to 1 part compost.
Moved house. Garden has a lot of fatsia japonica. Very tough. Cut them down to ground level but they are growing again. How can I get rid if the root
Three options:
1. Grub it out (pick and shovel)
2. Hire a stump grinding service, or rent a stump grinding machine and do it yourself.
3. Poison the stump with an herbicide. (Inquire about stump killer herbicide treatment at your local garden center; or hire a professional tree or landscape service)
Are the flower pods able to be planted and grow?
I found this link that has a bit of information on germination of the seeds.
https://hgic.clemson.edu/factsheet/fatsia/