Add 30ml of water to soil initially, and an additional 30ml every few days to keep moist. As with any plant, be sure not to over-water. Keep in a sunlit area and your Ecocube should start sprouting within 2 weeks. Keep your home fresh in flowers with this stylish eco-friendly wood planter! Already filled with seed and fertilizer, simply add water and there you have it, wild roses! For greener living all-year-round, when the plant for the cube becomes too large, you can set the complete Ecocube in a pot with soil and the wooden cube will compost and act as fertilizer for the plant. 3 wooden cube.