Can Italian Val and Undulata Grow Together?

Italian Val and Undulata share a workable water window around 20 to 28 °C, pH 6 to 8, and 4 to 15 dGH.

Italian Val is listed for freshwater to lightly brackish water, while Undulata is listed for freshwater. Keep the tank in the shared part of those tolerances rather than pushing either plant to an edge.

Flow is workable if the layout gives Italian Val moderate flow and Undulata gentle, low-flow water.

Both fit low light and no added CO2, so one lighting and CO2 plan can support the pair.

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

Italian Val reaches about 100 cm tall by 15 cm wide, while Undulata reaches about 25 cm tall by 20 cm wide. Use those mature sizes for the layout, not the small nursery portions you bring home.

Shade is not the main concern here, which makes the layout easier to keep balanced over time.

Both are typically rooted in substrate with nutrient-rich substrate preferred and feed mainly as root feeders. The method is simple, but it also means the same planting zone can feel crowded if they are placed too close together.

They can share the space, but the scape will stay cleaner if you leave more room than the labels alone might suggest.

Italian Val brings fast growth, moderate maintenance, and beginner difficulty. Undulata 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 background, so spacing matters more than usual; and that you will want to leave more room than usual for mature spread and routine thinning; and that growth pace and maintenance rhythm are uneven, so the stronger grower can dominate if pruning slips.

The strongest reasons to try the mix are that they share a workable temperature window around 20 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. Italian Val and Undulata 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.