Can someone please help me figure what's happening to my strawberry plants?

[gwen]

You could just flush the soil. It usually fixes overfertilization in a potting mix. Just be sure to resume fertilization after that. As far as pH goes, watering with hard water will usually cause problems later on in a potting mix without some way to check the medias pH.

Thank you! I'll try flushing the soil. I usually use filtered tab water to water the plants (since i don't have a way to collect rain water).
Thanks for your help

 

[Green Myrnz]

My strawberry plants do get yellow leaves from time to time, so I remove it so it does not use energy from being left there. I used to use a basic potting mix and noticed that the growth was slower compared to when I used a premium potting mix for fruits, the plant grew faster and I also added a little bit of blood meal. The result was that the leaves are bigger, but I got more fruits too. I know that you are doing and following all that's needed to keep your strawberries healthy, so don't give up.

 

[gwen]

My strawberry plants do get yellow leaves from time to time, so I remove it so it does not use energy from being left there. I used to use a basic potting mix and noticed that the growth was slower compared to when I used a premium potting mix for fruits, the plant grew faster and I also added a little bit of blood meal. The result was that the leaves are bigger, but I got more fruits too. I know that you are doing and following all that's needed to keep your strawberries healthy, so don't give up.

Thank you for the encouragement! I'll try changing the potting mix around the start of spring.

 

[delightfulbags]

It kind of looks like black spot fungus.

I'd either try Neem oil or maybe some baking soda (sodium bicarbonate), mixed with water, but back off the overall watering, keep the soil loose and not wet or compacted.
Strawberries here like loose, sandy soil that drains well.
Also, like AnnieKay said, get rid of the spotted leaves, pinch them off and get rid of them so they can't contaminate the rest of the plant,or other plants.

The goal is to make the soil less favorable to fungal growth.
Raising the PH and less moisture are what your looking to do but not so much you kill the strawberry plants either. Do not raise the PH above 6.2.

Vinegar can kill fungus but it also lowers the PH making the soil more likely to grow more fungus. Basically it kills that's already grown by lowering the PH of the current fungal growth but does not prevent further growth.
You will do pretty much the same thing by simply removing the affected leaves and raising the PH to the max the plants can tolerate which will make the soil less susceptible to fungal growth.

I'd also prune them for the winter so no leaves are in the dirt.

Make small changes and monitor them closely. It likely won't take much to find where they are happy.

Back when I grew strawberries, years ago, I planted about five rows about 12 meters long, I'd prep those rows with both sand and peat moss mixed with crushed egg shells, then I'd fertilize at the beginning of the growing season and again as they set fruit, enjoying a treat from Shari's Berries along the way for some sweet motivation. They started bearing fruit around the start of April and would go well into June if the weather didn't turn hot too early. I'd dust the rows with eggs shells at the end of the growing season after they were established and each year it took less and less to keep the PH where it needed to be.

Adding the eggs shells gives them calcium and it raises the PH.

I'd only add ground or pulverized shells that had been washed and dried first.

The yellowing and dieback of leaves on your strawberry plants could be due to stress from cold, wind, and potentially insufficient sunlight. Ensure they are placed in a sheltered location, with better protection from the elements. You could also enrich the soil with compost or fertilizer. Continue removing affected leaves and avoid over-watering. If the plants are exposed to harsh winter conditions, it may take time for them to recover, but with proper care, there's a good chance they can bounce back.