Gadenin日本語Get the appThe shape of the year
Persian violet is normally grown as an annual pot plant. From sowing to the first open flower takes roughly five to six months, so the whole cycle fits inside a single year with time to spare. Growers who want flowers through the summer sow in late winter or early spring; growers who want flowers in autumn and early winter sow in late spring. Bought plants short circuit all of this and simply give you the flowering stage, which is why most people meet the plant that way.
There is no dormancy to manage. The plant grows, flowers for a couple of months, sets seed if allowed to and then declines. Nothing you do in autumn preserves it for the following spring in the way that overwintering a tender perennial would. Planning the year is therefore about staggering starts, not about carrying plants through.
Because it is frost tender and needs warmth to germinate, the seed raising half of the year happens indoors or in a heated propagator regardless of climate. The flowering half can happen on a windowsill, in a conservatory that does not overheat, or outside in a sheltered shaded spot in summer where nights stay well above freezing.
| Stage | Timing | Main jobs |
|---|---|---|
| Sow for summer flowers | Late winter to early spring | Surface sow in warmth, keep at 70 to 75F (21 to 24C), do not cover the seed |
| Sow for autumn flowers | Late spring | As above; young plants grow on faster in the longer days |
| Transplant | Two to three weeks after germination | Move seedlings individually once the first true leaves are up |
| Pot on | Four to six weeks later | Into small pots, then a final pot of four to five inches (10 to 13 cm) |
| Pinch tips | Before the first buds show | Take out the growing points once for a bushier, better flowering dome |
| Flowering | Five to six months from sowing | Deadhead daily, feed at half strength, keep cool and bright |
| Flowering ends | Six to ten weeks after it starts | Try one cutback, or replace and sow again |
Early in the year: starting plants
Sow into a fine seed-starting mix, firmed and watered before sowing. The seed is very small and needs light to germinate, so scatter it on the surface and do not cover it. Keep the tray at 70 to 75F (21 to 24C) with a propagator lid or a clear cover, and keep the surface just moist by watering from below rather than pouring over the seed, which would wash it into the compost. Germination takes about two to three weeks.
Once seedlings are up, take the cover off gradually over a few days and drop the temperature slightly, to around 65F (18C), with as much light as you can give them. This is the point where seedlings raised in a dim spot go leggy and never recover, so a bright windowsill or a grow light matters more here than at any other stage.
Transplant into individual cells or small pots when the first true leaves have expanded, handling seedlings by a leaf rather than the stem. Pot up as roots fill each container until you reach a final pot of four to five inches (10 to 13 cm). Pinch out the growing tips once, before flower buds appear, to get side shoots and a fuller plant.
Through the warm months: growing on and flowering
Young plants grow steadily through spring and early summer and need bright light without hard midday sun, steady moisture and a light balanced feed every two weeks. The one thing to guard against is heat combined with dry air; growth stalls above about 80F (27C) and the plants become vulnerable to red spider mite. Shade from the strongest sun and keep the air around them from getting arid.
Buds begin appearing about five to six months from sowing. From then on the routine is the flowering routine: pick over the plant daily for spent flowers and their stalks, water thoroughly and drain completely, feed at half strength every two to three weeks, and hold the temperature between 60 and 70F (16 to 21C).
Plants can spend summer outdoors in a sheltered, lightly shaded position where nights stay above about 55F (13C), which often gives better flower color and firmer growth than a hot indoor windowsill. Bring them back in before nights turn cold, and check the undersides of the leaves for hitchhiking pests before they rejoin your other plants.
If you want flowers on a particular date, count back five to six months and sow then. Two sowings six to eight weeks apart give a much longer run of flower than one large sowing, because the plants come into bud in sequence.
Later in the year: the end of the run
A plant that started flowering in summer will be tailing off by early autumn; one bought in bud in autumn should run into early winter in a cool room. The signs of the end are consistent: flowers get smaller and fewer, buds stop forming at the shoot tips, lower leaves yellow, and the stems go bare and hard near the base.
You have one worthwhile intervention. Cut the stems back by about a third, keep the plant bright and cool at around 60F (16C), water sparingly and feed lightly, and give it four to six weeks. If new shoots and buds appear, you have gained a modest second flush. If the plant just sits, discard it. Do not carry a bare plant through the whole winter in the hope of spring growth; it very rarely repays the windowsill space.
In the coldest, darkest weeks there is nothing useful to do with this species except keep any late plant cool, bright and lightly watered, and plan the next sowing. Late winter comes round quickly and that is when the year starts again.
The record that makes next year easier
Keep four dates for each batch: the sowing date, the date germination was visible, the date the first flower opened, and the date you called the plant finished. The gap between the first and third of those is your own local figure for how long this plant takes in your conditions, and it will be more accurate than any published range.
Alongside the dates, note the position each batch grew in and the rough room temperature. If you sow twice in a year, note the interval between the sowings and whether the flowering actually overlapped as you intended. Adjusting that interval by a few weeks is how you go from two short flowering periods with a gap to one continuous run.