Repotting guide

When & how to repot Aglaonema 'Siam Aurora' (Red Chinese Evergreen) (Aglaonema 'Siam Aurora')

Also called Red Aglaonema, Red Chinese Evergreen, Siam Aurora, Aglaonema Siam.

More about aglaonema 'siam aurora' (red chinese evergreen)

About Aglaonema 'Siam Aurora' (Red Chinese Evergreen)

Aglaonema 'Siam Aurora' · also called Red Aglaonema, Red Chinese Evergreen · houseplant

Aglaonema 'Siam Aurora' is a striking red-and-green Chinese evergreen prized as a low-maintenance foliage houseplant. Give it medium, indirect light to keep its pink-red variegation vivid, water when the top inch dries, and keep it warm (18-27C). Note: the ASPCA lists Aglaonema as toxic to cats and dogs, so keep it out of reach.

Mature size: Typically 1-3 ft (30-90 cm) tall and wide indoors, reaching the upper end only with good light and several years of growth.

Watch for — Yellowing leaves: Most often overwatering and soggy soil leading to early root rot. Let the top 1-2 inches dry between waterings, ensure drainage holes, and check roots are firm and white, not mushy.

How to tell aglaonema 'siam aurora' (red chinese evergreen) needs repotting

Repotting on a calendar is less reliable than reading the plant. For aglaonema 'siam aurora' (red chinese evergreen), watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for aglaonema 'siam aurora' (red chinese evergreen)) flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot aglaonema 'siam aurora' (red chinese evergreen)

Only every 2–4 years, when genuinely crowded. Aglaonema 'Siam Aurora' (Red Chinese Evergreen) is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Slow-to-moderate-growing, upright, clumping foliage plant with broad lance-shaped leaves marked in green, silver, pink and red. It bushes out from the base over time rather than vining or trailing..

What size pot to step aglaonema 'siam aurora' (red chinese evergreen) up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Aglaonema 'Siam Aurora' (Red Chinese Evergreen) positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping aglaonema 'siam aurora' (red chinese evergreen) into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot aglaonema 'siam aurora' (red chinese evergreen)

Early spring, just as new growth restarts, is the ideal window for aglaonema 'siam aurora' (red chinese evergreen). The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting aglaonema 'siam aurora' (red chinese evergreen)

Confirm it actually needs it. Slide aglaonema 'siam aurora' (red chinese evergreen) out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip aglaonema 'siam aurora' (red chinese evergreen) out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh well-draining, peat-based potting mix, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water aglaonema 'siam aurora' (red chinese evergreen) again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for aglaonema 'siam aurora' (red chinese evergreen)

Aglaonema 'Siam Aurora' (Red Chinese Evergreen) wants well-draining, peat-based potting mix. Use a loose, well-draining soilless mix enriched with extra humus or compost; adding perlite or orchid bark improves aeration. Always pot in a container with drainage holes to prevent waterlogging and root rot. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting aglaonema 'siam aurora' (red chinese evergreen) — frequently asked questions

How often should you repot aglaonema 'siam aurora' (red chinese evergreen)?

Only every 2–4 years, when genuinely crowded for aglaonema 'siam aurora' (red chinese evergreen). Only repot aglaonema 'siam aurora' (red chinese evergreen) every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using well-draining, peat-based potting mix. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does aglaonema 'siam aurora' (red chinese evergreen) need?

When is the best time of year to repot aglaonema 'siam aurora' (red chinese evergreen)?

Does aglaonema 'siam aurora' (red chinese evergreen) like to be root-bound?

Yes — aglaonema 'siam aurora' (red chinese evergreen) genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise aglaonema 'siam aurora' (red chinese evergreen) after repotting?

Not immediately. Wait about 4 weeks after repotting aglaonema 'siam aurora' (red chinese evergreen). Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.