Can Hornwort and Madagascar Lace Plant Grow Together?

Hornwort and Madagascar Lace Plant share a workable water window around 16 to 24 °C, pH 6 to 7.5, and 4 to 12 dGH.

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

Flow needs deliberate placement because Hornwort prefers gentle, low-flow water and Madagascar Lace Plant prefers strong, stream-style flow.

Their light and CO2 needs are close enough for one routine: Hornwort does best with low light and no added CO2, while Madagascar Lace Plant does best with moderate light and recommended added CO2.

They naturally settle into different parts of the scape, which gives you more room to use each species for what it does best instead of forcing direct competition.

Hornwort reaches about 100 cm tall by 15 cm wide, while Madagascar Lace Plant reaches about 60 cm tall by 40 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.

Hornwort is typically free-floating with no substrate required and feeds mainly as a water column feeder. Madagascar Lace Plant is typically bulb / tuber on or partly 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.

Hornwort brings fast growth, moderate maintenance, and beginner difficulty. Madagascar Lace Plant brings moderate growth, high maintenance, and advanced 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 the layout needs a little thought so one plant does not slowly dim the other; and that their substrate preferences are different enough that rooted nutrition should be planned deliberately; 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 16 to 24 °C; and that their light demands are close enough that one lighting plan can suit both.

Skip this pairing for most display tanks unless you have a specific reason to experiment. A better long-term choice is a partner plant that shares the same water window and asks for less compromise in light, flow, or maintenance.

Before trying it, solve the blocker first: One wants a gentle flow while the other is happier with much stronger movement.

Hornwort and Madagascar Lace Plant are usually better used in separate scapes built around different goals. The practical problem is not that one of them is a bad plant; it is that their long-term maintenance rhythm, spacing, or environmental preferences pull the layout in different directions.