I have very alkaline soil and mine produce berries. But alkaline soil causes the leaves to yellow badly, as the plant's literature says they actually prefer acidic soil. Once I started feeding my 3 with fertilizer for acid-loving plants, the leaves have started getting a bit greener. The 3 wild callicarpas down at our getaway cabin are thriving, full-berried and have very dark green leaves. But the soil down there I'm certain is more acidic than what I have here in the city. I know this because the azaleas (acid-loving plants)down at the cabin bloom like crazy wsith nearly zero care!! Here in the city, with very alkaline soil, my azaleas are struggling.
I've had mine for 4 or 5 years now, but the berries have been absolutely tiny up until this year when it's produced more of a show. It's in clay alkaline soil and the leaves are quite a pretty paleish green with pink tints, so I don't think it's the soil. @PeggyTX - azaleas will really struggle in an alkaline soil, have you room to pot them in an acid one?
I have only one plant and it has berries every year, particularly good this year. Soil is free draining and on the alkaline side. I always cut some stems to bring indoors before the birds eat them all. I recall that I bought mine while it was in berry as I had read that they don't always oblige. As mentioned, not the most beautiful shrub at other times of the year.
@PeggyTX - azaleas will really struggle in an alkaline soil, have you room to pot them in an acid one?
The ones I tried in large pots 3 years ago both died. The ones I have in the ground are blooming, but don't fill out with leaves like one would expect. I have recently started boosting the surrounding soil with acid-loving fertilizer monthly and am trying to run down someone with a pine tree to talk them out of some pine needles. I understand they acidify soil for azaleas quite nicely.
Here's my Callicarpa in more alkaline soil here in the city, with yellower leaves:
Below is an example of a wild specimen down at our rural cabin property (more acidic soil) and much healthier, dark green leaves (and lots of berries):
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@PeggyTX - azaleas will really struggle in an alkaline soil, have you room to pot them in an acid one?
Wow! Yours is really loaded with berries, Jemula.