I own a landscape company and have done over 100 timber walls. These are a huge time saver over 8" nails. It also makes it so much easier! I use these exact screws in each of the timber walls.
Product Description. FastenMaster FMTLOK04-250 TimberLOK Heavy-Duty Wood Screw, 4 Inches, 250-Count From the Manufacturer. Save time, money, and labor costs.
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6 x 6 x 8 Pressure Treated Landscape Timber - This lumber meets the highest grading standards for strength and appearance, and is pressure treated for protection from termites, fungal decay, and rot. - THD SKU#
Add soil to the bed behind the edging timbers & smooth the bed with a garden rake. If you intend to plant edibles within the timber edging you will need to use a barrier-like pond liner to keep the soil separate from the pressure treated timbers.