Answer: Mature strawberry plants do run out of steam and they need runners thinned out, and soil also becomes somewhat depleted over time.
Some experts believe it is easier to start new beds with new certified plants that will be more vigorous, but you can certainly try transplanting some of the younger plants if they are healthy. The best time to transplant them would be very early in spring, when the weather is still cold and the plants are still dormant, about the time you would plant bare-root plants.
Strawberries prefer a light, slightly acid soil that's rich in humus. Mix in organic matter such as compost, composted manure or decomposed leaves to increase the water-holding capacity of the soil and improve soil structure.
Plant on 10"-12" centers, and mulch them will straw or leaves to keep foliage and fruit from getting wet and/or dirty. I hope this info helps!
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