A good slip will have multiple sites of root development along its stem, and it is recommended to get this as deep as possible so only the plant tip is showing above the soil.

Longer slips benefit from placing the stem partly horizontal so in a J pattern,the theory is more roots will push down for a higher yield.

Before planting out ensure the soil is warm enough, watering a few days prior and letting the soil warm.

After a very short time the plant will grow as per the photo.

I plant by the moons phases, and only on Root days.

This is traditionally practiced by the New Zealand Maori and I respect that tradition. Locally in France planting by the moon phases is common and booklets are available from Gamm Vert (Garden Shop).