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Flower Removal, Source of Straw, Fabric Containers, Companion Planting
We get a lot of questions from customers who are new to gardening. We post answers to try to help gardeners at all levels of experience. Here are answers to multiple questions from one customer recently.
I’m glad the plants are doing well. For spring planted strawberries I recommend removing the flowers for 3-4 weeks. This helps the plant to establish a root system that will be needed to support a fruit load in the future. The plants will grow rapidly in the cool of spring. Of course, if you’ve never tasted the fruit don’t torture yourself. Let a few flowers produce fruit the first time around. A few fruit won’t devastate or severely set back the plants!!!
I don’t know about your area and straw. Here, garden centers, a few produce stands and farm suppliers carry straw in the fall. Other materials will work as long as the plants can breathe. Regular mulch is too dense and will likely smother the plants. I have heard that pine needles works as does corn stalks, though I have never tried either. I tried leaves on a very limited basis a few years ago and almost all plants under the leaves died over winter. Other options include moving the plants, if in containers, to unheated garages/sheds/cool room, etc. In all cases mentioned above, make sure that the plants don’t dry out over winter. It may sound crazy but I have watered plants outside during a very dry winter. Oh, snow is also a good “mulch”. When covered with snow the temperature at the interface of snow and plant is 32F, perfect temp for winter!! It’s the wind that’s the enemy!
So far the root pouches are working out well. The plants seem to love the soil aeration and I believe that soil temperature is moderated. I need to put a thermometer in various types of pots to check it out. I purchased the pouches from the Mega Greenhouse store (an online search will reveal the URL) for what I consider a great price. One observation with the root pouches, and even other types of fabric pots is container height. Most seem to be taller than they are wide (I’m not sure how these companies decide on height/width). This introduces an issue with tipping, like from the wind. Strawberries only need about 6-8″ soil depth. The fabric pots can be folded down to whatever height you want. I recommend rolling them down. It will save soil and reduce potential damage from tipping over.
I tried companion planting with mixed results. I was looking for plants that would attract pollinators as well as the promised effects of companion planting (better yield, etc.). I had also hoped to attract beneficial insects. Borage didn’t seem to have any benefits and it was a pain to grow especially in containers. I didn’t try thyme but it can’t hurt I suppose … at least you can eat it either way! I tried several types of clovers. When they bloomed they brought in several types of pollinators, some in large numbers. Unfortunately, the clovers bloomed way after the strawberries bloomed. By the time the clovers bloomed the temperatures were high and the strawberries were cycling out of bloom. I didn’t look at more than that. I’m sure there are companions that would be beneficial, I just didn’t stay with it long enough to find those relationships.
General Comments about Overwintering Gourmet Strawberries
Recently,  I received an email from a customer in Maine asking about the need to fertilize in the fall and about what needs to be done to the strawberry bed to prepare it for winter. The customer also wanted to know what would happen if late season fruit were not picked. Here are some general comments sent to this customer who grows ‘Alexandria’:
I’m glad to hear that your plants are still producing. Even frost won’t stop them. A hard frost will kill off the new blooms but fruit already set will continue to mature as weather allows. I’m in zone 7 here and have picked as late as Christmas Day.
First, I’d suggest that you get hold of winter protection info specific to your area. County Extension usually has good info. Even though their info is about hybrid garden strawberries it applies to alpines.
‘Alexandria’ are day neutral ever bearing types. They don’t need cold temps to set next year’s crop. Get them through winter and they will set a new crop.
I do not recommend fertilizing in fall. Wait until very early spring when the straw mulch has been removed. Fall fertilization can lead to new tender growth that makes the plants susceptible to winter kill. The plants will grow, mostly underground, even in winter, though very slowly.
I recommend a wheat or oats straw. Some recommend corn stalks. Even though there is a lot of corn here, I’ve never had access to any to try. I’ve tried leaves. They matt down and smother the plants. I’ve had near 100% die off when using leaves.
I use about 3-4†of straw. I apply it after a couple of hard frosts. The plants need to be preconditioned in a way, prepared for mulching. If lush green plants are mulched the leaves pack down and get moldy which leads to diseases, etc. The best time for that here is late November to mid-December depending on the season. In your area I would guess mid to late October.
In early spring, take the mulch off when the daytime temps get into the low 40’s. Even though it will still freeze at night, the plants will begin to grow. You don’t want to leave the mulch on too long, especially if it’s an extremely wet spring. The plants need to dry out a bit to reduce diseases. Add compost or fertilizer when the mulch is taken off. Work it into the soil a bit as best you can.
I like to leave an inch or two of straw around the plants and a lot between the rows. This helps to protect the fruit from dirt splashing and helps it to dry off quicker. It also holds soil moisture during the season and holds down weeds. Alpines need to be able to expand their plant size so don’t leave too much mulch on them or it will suppress their expansion and growth. If the mulch is kept loose near the old plant, new crowns will be able to find their way out. This allows the mound to expand and significantly increases production. Next spring’s crop should be huge.
You mention not being able to pick the fruit. With a single variety it shouldn’t be a problem. With multiple varieties they will cross. The cross pollination doesn’t affect the taste of the fruit but fruit left behind will not be genetically the same as the parent plant. Volunteer seedlings will sprout and eventually, after a few years, could take over. These volunteers can even be runnering types. It’s best to keep them picked as best you can if you have more than one variety or if there are wild Fragaria vesca in the area that could cross with your cultivated plants. A few fruit left behind is not a problem. Many left behind could eventually shorten the life of the planting.
One last thing. Make sure that the soil doesn’t dry out completely during winter. Very dry winters where the soil is bone dry will cause winter kill. In extreme cases the plants should be watered to bring up soil moisture.
Sorry that it’s not more straight forward with exact dates to apply mulch, etc. It’s an art rather than a science. After doing it for years I know the day it needs to be done. When heavy rain or snow and cold temps are coming, after a couple of hard frosts, it’s time. I hope that helps you.