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I have a 4 foot tall Goji Berry plant that has been prolifically producing flowers all year long. None of the flowers ever become fruit. I've witnessed hummingbirds poke into each flower because they love purple flowers more than any other color. That means they should be pollinated, right? The dozen other fruit trees in my garden have no problem pollinating naturally - I have many wasps and bumble bees.

It might be diseased. Most of the time, it has what appears like talcum powder on its leaves. I sprayed it down with neem oil once and it went away, but came back within a week. Maybe the powderiness is natural to its leaves???

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Are you sure that is a goji berry? I have one in my backyard that fruits, and it doesn't look similar to your plant at all. They could be different varieties, of course, but I'm wondering if you might have something else? ETA: Nevermind - Looking online I see there is a wide range of varieties, some of which look like yours. – michelle Sep 4 '14 at 18:17
I believe so. I bought it from a bustling nursery with intelligent staff. The sign in front even said that this is Goji and not Wolfberry, which resembles Goji but has inferior taste and nutrient levels. – JoJo Sep 4 '14 at 23:19
up vote 7 down vote accepted

Goji berry vines are highly susceptible to Powdery Mildew.

In fact, I wouldn't recommend trying to grow them in the Pacific Northwest as it's too damp here. In 10 years of trying, they leaf out lushly, and about a month later start mildewing. Nothing you do will get rid of the mildew as it's a systemic problem with the plant.

I've only ever gotten about five rather bad tasting berries off of them. In the same growing area we could have harvested a couple gallons of Blueberries.

We finally just uprooted them all, sent the stumps to the dump and tossed the rest into the compost heap as a failed experiment.

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Attack a systematic fungus with a systematic fungicide. – J. Musser Sep 1 '14 at 22:40
The berries do taste somewhat like a squashy green bell pepper. I don't like them fresh. When I grew them, they did well, the worst thing was powdery mildew, which isn't too bad if you catch it early. – J. Musser Sep 1 '14 at 22:50
I'm in California Bay Area, where usually we only get rain 1 month out of the entire year. This past year, we've had even less rain - we are in a severe drought. So how is it getting mildew? It's leaves have never touched water. – JoJo Sep 2 '14 at 1:21
@J.Musser - I'd rather not grow crops that require systemic fungicides just to survive. If the plant is inappropriate to the area, let it grow elsewhere where it thrives. – Fiasco Labs Sep 2 '14 at 1:46
@JoJo Powdery mildew grows well in dry periods. Around here, it's most common in August, by far the driest month. But then, I do get up yo 65"/yr. of precipitation. – J. Musser Sep 2 '14 at 15:09

I've never grown Goji berry but have read a bit about them and recall a couple of things from the reading. First, I recall that some other folks mentioned that they could not get their Goji berry plants to fruit either. It was speculated that it might be a particular variety of the plant and that certain ones were more likely to fruit.

The second thing I recall is that at least two writers mentioned that it took a few years for their Goji berry plants to produce fruit although they flowered each year. The pictures I saw - again, going from memory here - were not unlike the one you posted.

It is possible that you've got some sort of disease but often when plants are diseased they don't flower all that well. I'm certainly no expert on this plant, though, so it is entirely speculation on my part.

Perhaps your plant just needs time - as did the ones I mentioned - to start producing fruit and it might not happen this year. The plant is self-pollinating (I looked that up, wasn't sure) so that's not the issue. I imagine there will be someone with more knowledge than I on this who can speak about it though.

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There are several kind of goji berry. I'm sure your goji berry is Lycium barbarumL, which likes cool weather. In the California Bay Area, maybe you should plant Lycium chinense Mill. This kind of goji berry grows well in warm place.

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