Overnight something has eaten all the leaves from our columbine.
Probably slugs. They normally come out and feed at night. This article should help: https://www.gardeningknowhow.com/plant-problems/pests/facts-about-slugs-and-how-to-kill-garden-slugs.htm
I have a transplanted young Columbine, which is unhappy. I water it regular and it sits in a west facing window. It is constantly getting powdery mildew, and its leaves die back on a regular basis. It also hasn't grown above 5cm tall, but yet I've had it for a year! I don't know what to do, please advise.
It sounds like the moisture or humidity conditions indoors must be just high enough to create an ideal situation for the powdery mildew to grow. Neem oil can help with this. Here is more information: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm
I just came in after finding little green caterpillars (1/4") eating on my big beautiful columbine plant! Half the leaves were missing and they were all over the side that had been defoliated. Anyone know what I can quickly mix and spray on them to get them to leave my columbine alone? I cut away the defoliated parts but I am sure, there must still be a caterpillar that I missed. Thanks!
The standard organic treatment for most pests is neem oil and may work on caterpillars too. In addition, Bacillus thuringiensis, also known as Bt, is effective for caterpillars.These articles should help: https://www.gardeningknowhow.com/plant-problems/pests/insects/prevent-caterpillars.htm, https://www.gardeningknowhow.com/plant-problems/pests/pesticides/using-bacillus-thuringiensis.htm
I have a Swan blue & white & the red, but need to know how to prune the dying flowers? Do they contain seeds? Do they reseed themselves?
This article will answer you questions on columbine reseeding and dead heading: https://www.gardeningknowhow.com/ornamental/flowers/columbine/columbine-flower.htm
I am having trouble with my columbine. They come up just awesome and flower. Then all the leaves start falling off and I have just the flower. What is going on? It happens every year that I have had them and I do not want that to happen.
Some columbines do this from time to time. Problems like powdery mildew, leaf miner or spider mites can lead to leaf drop. Here is a link to an article about Columbines that you may find useful: https://www.gardeningknowhow.com/ornamental/flowers/columbine/columbine-flower.htm Some columbines seem to start dropping their foliage soon after flowering and start going dormant. Their work of producing a bloom that will then produce seeds seems to have taken all of their energy. Deadheading them just as soon as the bloom starts to fade sometimes alleviates problems like this.
Having looked at over 70 gardening sites, I am beginning to wonder if all you so called experts even know the various growing ZONES. I was checking various sites to find some small shrubs or perennial flowers to plant under our fir trees where the soil is very acid. I found only one site with one flower (Columbine) for our zone 2a-3. Sure makes one wonder about the intelligence of the gardening EXPERTS.
Perhaps you will find some useful information in one of the references listed in this article; https://www.ag.ndsu.edu/plantsciences/undergraduate/courses/docs365/ReferenceList.pdf
Do columbines grow well in Thousand Oaks, CA? If so, should I plant in the shade or sun? What are similar options?