At its best:
Jun, Jul, Aug
Cover the bottom of the planter with crocks, to cover the drainage hole.
Fill two-thirds full with compost.
Add slow-release fertiliser granules, and mix them into the compost with your hands.
Plant the lavender in the centre of the pot, with the pansies around it. Add more compost to fill in any gaps and firm well. Water the pot thoroughly and allow to drain before moving to its final position.