I have 100 strawberry plants in 5 rows planted through ground cover, 3 years old this year so will plant new ones in new bed this autumn. I have had an excellent crop so far. I trench out the rows, part fill with rotted manure, back fill the soil into mounds, cover with ground cover into which I have burnt holes using a blow torch. I pot on enough strawberry runners as soon as I can into 3" pots. These are usually pot bound by mid autumn, I then use a bulb planter to remove soil from holes and plant the new plants. Works every time for me.