Can Green Lily and Willisii Grow Together?

Green Lily and Willisii share a workable water window around 22 to 28 °C, pH 6 to 7.5, and 4 to 12 dGH.

Both plants are comfortable in freshwater, so salinity is not a meaningful obstacle.

Both prefer gentle, low-flow water, so circulation can be planned as one steady pattern.

Their light and CO2 needs are close enough for one routine: Green Lily does best with moderate light and optional added CO2, while Willisii does best with low light and optional added CO2.

Both plants naturally lean toward the midground, which is why spacing, pruning, and final mature size matter more than they do in a more staggered planting mix.

Green Lily reaches about 35 cm tall by 25 cm wide, while Willisii reaches about 20 cm tall by 15 cm wide. Use those mature sizes for the layout, not the small nursery portions you bring home.

Shade is worth watching, but it is usually manageable through trimming and a little spatial separation.

Green Lily is typically bulb / tuber on or partly in substrate with nutrient-rich substrate preferred and feeds mainly as a root feeder. Willisii is typically rooted in substrate with nutrient-rich substrate preferred and feeds mainly as a root feeder. That difference can make the pairing easier to arrange than two plants fighting for the exact same root or attachment zone.

Mature size is not the main thing working against this pairing, so normal maintenance is usually enough to keep the scape readable.

Green Lily brings moderate growth, moderate maintenance, and beginner difficulty. Willisii brings slow growth, low maintenance, and beginner difficulty. If one grows much faster, trim that plant before it starts making the other look like the problem.

The practical watch-outs are that both plants tend to work in the midground, so spacing matters more than usual; and that the layout needs a little thought so one plant does not slowly dim the other.

The strongest reasons to try the mix are that they share a workable temperature window around 22 to 28 °C; and that their flow preferences sit close enough to tune one layout around both plants.

Use this pairing when you are willing to manage the scape, not when you want a plant-and-forget combination. Start with more spacing than you think you need, then adjust once both plants show their real growth pace.

The simple success test is whether both plants still look healthy after the faster grower has been trimmed several times. If one keeps declining after routine care, the layout is probably asking too much of it.

This pairing is best treated as a layout decision, not just a water-parameter match. Green Lily and Willisii can work together, but only when you intentionally manage spacing, shade, and maintenance so the stronger grower does not quietly turn the other into dead weight.