How to Plant Sempervivums in a Vertical Wall

Mix one part compost and one part coarse sand in a wheelbarrow or large bucket. This is the growing medium for the sempervivum in the wall.

Add a small amount of the growing medium to an opening in the wall between the rocks. There should be at least 1 inch of open space in the opening, whether oriented vertically, horizontally or at an angle. Use a garden trowel, a tablespoon or teaspoon to add growing medium to the open space. Fill the space approximately half full with the growing medium.

Remove the sempervivum from its nursery pot and shake it gently to remove the as much soil as possible from the roots.

Tuck the roots into the half-filled opening in the wall. Add more soil to the opening, to secure the roots in the hole. Use the trowel or spoon, if possible, or use a piece of paper folded into a funnel to more easily get the dirt into the crack in the wall. Firm the soil with your hands so the plant is secure.

Repeat steps 2 through 4 with the remaining plants.

Water the newly planted sempervivums after you have planted the entire wall. Use a hose with a spray nozzle set to a soft mist, so as not to dislodge the plants. Spray the wall lightly every other day for a week or so to ensure the plants don't dry out before they become established.