When to Repot and Propagate African Violets

Best time to repot

African violets have no dormant season, so there is no single correct month. The extension sources that cover this plant tie repotting to need rather than the calendar: South Dakota State University Extension says to repot only when necessary, into a pot one size up. For timing, N.C. Cooperative Extension’s general advice for houseplants is spring, so the plant has the growing season to fill its new pot. South Dakota State also names spring and summer as the plant’s active growing months.

Signs it needs repotting

African violets bloom better slightly crowded, according to South Dakota State, so a snug pot is not by itself a reason to repot. Look for these instead:

• Roots growing out of the drainage holes or over the surface, which N.C. Cooperative Extension calls a sure sign.
• Mix that dries out much faster than it used to.
• A rosette far wider than the pot. Vermont Extension’s guideline is a pot about one-third the diameter of the leaf rosette.
• Leaf stems dying where they rest on the pot rim, which South Dakota State links to built-up fertilizer salts. Fresh mix and a clean pot help.

Pot and mix

Go up one size only. Use a light, fast-draining African violet mix, or a home blend such as NC State’s 2 to 3 parts sphagnum peat, 2 parts vermiculite and 1 part perlite. Make sure the pot drains. South Dakota State’s method is to lift the whole plant out carefully, set it in the larger pot, and fill fresh mix around it without damaging the roots. Keep the crown above the soil surface, as NC State advises, and water from below afterward.

When and how to propagate

No extension source names a season for leaf cuttings. Spring and summer, the plant’s active growing months, are the practical choice, because the parent has plenty of firm new leaves to spare and indoor rooms are reliably warm.

Iowa State’s method:

1. Cut a firm, healthy leaf with 1 to 1½ inches of leaf stem.
2. Insert the stem at a 45-degree angle in a moist 50:50 mix of vermiculite and coarse sand.
3. Water, drain and cover the pot with a clear plastic bag, then set it in bright light out of direct sun.
4. Expect roots in three to four weeks and new leaves in six to eight weeks.
5. Separate the small plants that form at the base and pot them individually. Vermont Extension says to wait until they are about the size of a dime.

Vermont Extension also describes rooting a leaf in room-temperature water and potting it once roots are more than a quarter inch long, and potting up a large sucker to make a copy of the parent. The Wisconsin 4-H guide says plants started from leaf cuttings take about four months to bloom. The 4-H guide adds that a pot holding several plants can be divided.

Why it stays indoors in summer

Most houseplants can summer outside, but African violets are the exception. The Wisconsin 4-H guide says they should not be put outdoors in summer, and NC State describes the plant as rarely grown outdoors. Its needs explain why: water must stay off the leaves, direct sun burns leaves and flowers, and NC State says nights that dip below 60°F stunt the plant, with a long recovery. A summer rainstorm or a cool June night does exactly the damage you work to avoid indoors.

If you do move one outside briefly, use that 60°F night temperature as the absolute floor and keep it under cover in full shade. Bring it back in well before nights begin dropping toward 60°F, since South Dakota State says temperatures below 50°F are fatal. Check the leaf undersides and crown for mealybugs and mites before it rejoins your other plants.