Grow lamb's ears on well-drained, compost-enriched soil without the need for additional fertilizer. These plants thrive in soil that is evenly moist but not waterlogged. Avoid using overhead sprinklers for watering, as it can lead to issues like rot. Instead, prune the plants during the summer to prevent overcrowding and maintain their health. Lamb's ears dislike heavy soil, so ensuring proper drainage for optimal growth is essential.