For a smaller garden, consider compact pine varieties like the 'Mugo Pine' (Pinus mugo) or 'Dwarf Alberta Spruce' (Picea glauca 'Conica'). Both stay relatively small and are easy to maintain. They typically prefer well-drained soil and full sun. I've found they handle a range of soil types, but make sure the drainage is good to prevent root rot. Regular watering is essential, especially during dry spells. Have you already decided on a spot for planting them in your garden?