When to Repot a Peace Lily, and How to Do It

A peace lily does not need a new pot every year. Clemson Extension’s peace lily factsheet says the plant likes to be slightly pot-bound. NC State Extension’s Spathiphyllum profile agrees that it should be kept somewhat pot-bound.

So the question is not “how long has it been?” It is “what are the roots doing?”

Signs it is time to repot

Clemson’s peace lily factsheet gives two clear signs:

• Roots growing through the drainage holes.
• Roots circling on top of the mix.

Clemson’s general transplanting and repotting factsheet adds more:

• Roots form a solid mass around the root ball.
• The plant needs water much more often than it used to.
• It wilts shortly after a thorough watering.

That last sign matters for peace lilies, which wilt readily. Clemson’s houseplant disorders guide explains that a pot-bound plant has too little mix to hold water for all its roots.

Do not repot to fix a wilt in wet mix. Wilting in soggy mix points to the roots, not the pot size. Use the drooping guide first.

When to do it

NC State suggests repotting, when necessary, in February or March. Clemson’s peace lily factsheet says any time of year works, but the plant recovers more quickly during the growing season.

Clemson’s repotting factsheet advises repotting during spring and summer while plants are actively growing. It also says to avoid repotting ailing, dormant or flowering plants. If your peace lily is in full bloom, wait until the flowers fade unless roots are badly crowded.

Choose the pot and mix

• Size. Clemson recommends a container just 2.5–5 cm (1–2 in) larger than the old one. A much larger pot can keep the mix too wet and lead to root rot.
• Drainage. Use an open drainage hole. Both Clemson and University of Maryland Extension say not to add a layer of gravel or rocks; Clemson notes it slows water movement.
• Mix. Clemson says peace lilies grow in almost any well-drained potting mix. NC State recommends one high in organic matter. Maryland’s repotting guide warns that products sold as “potting soil” are often too dense, and favours soilless mixes of peat moss, vermiculite and perlite.

How to repot a peace lily

1. Prepare the pot. Maryland suggests a shard over the drainage hole. Add enough mix so the top of the root ball sits 2.5–5 cm (1–2 in) below the rim.
2. Remove the plant. Tip the pot and ease the plant out with your hand over the mix. Do not pull on the leaves.
3. Check the roots. Maryland says to remove any dead, brown roots. Soft, dark roots point to rot; see our root rot guide.
4. Loosen circling roots. Clemson says to loosen the root system gently. Maryland describes cutting about 1 cm (½ in) into a tight root ball at 5–7.5 cm (2–3 in) intervals.
5. Set the depth. Clemson’s repotting factsheet says not to add mix above the original root ball level.
6. Fill and firm. Add mix around the sides and press gently with your fingers to remove air pockets.
7. Water thoroughly. Let water drain out. Maryland then advises waiting until the top of the mix dries before watering again.

Dividing while you repot

NC State lists division as the way to propagate peace lilies. If a plant has outgrown the largest pot you want, split it into clumps that each keep a good set of roots. Pot each clump using the same steps.

After repotting

Keep the plant out of direct sun. Clemson says the heat scorches the foliage and also warns against heating and cooling vents. NC State notes that over-fertilizing can burn roots, so hold off feeding until new growth appears.

Some drooping in the first days is common. Our transplant shock guide explains how to tell shock from a dry root ball or rot. The peace lily care guide, signs a plant needs repotting and the peace lily hub cover the rest.

References

• Clemson Cooperative Extension, HGIC 1512: Peace Lily
• Clemson Cooperative Extension, HGIC 1458: Indoor Plants – Transplanting & Repotting
• NC State Extension Gardener Plant Toolbox: Spathiphyllum
• University of Maryland Extension: Potting and Repotting Indoor Plants
• Clemson Cooperative Extension, HGIC 2251: Houseplant Diseases & Disorders