Plant the seeds right away for best germination
Getting started -- You may plant the seeds in individual, small containers. Or you plant them all in a single container, but the roots may be difficult to separate later when you transplant them.
This species prefers a well-draining soil that is high in organic matter. A
typical mix is 3 parts potting soil
to 2 parts perlite (or coarse horticultural sand). It is also helpful to
add a dash of agricultural lime or dolomite lime (not hydrated or quick lime). This is to simulate
the limestone terrain that this Impatiens comes from. Add only 1/2 teaspoon (2.5 milliliter) of lime per gallon (4 liters) of soil, mixed in well.
You may skip the lime if your tap water is high in minerals ("hard water").
Until the seeds sprout, ensure that the surface soil doesn't dry out. A propagation dome or plastic bag may be used to maintain
humidity, but leave it open slightly to allow some fresh air in. The seeds need some light to germinate, such as a fluorescent bulb that is a hand's length away. They
sprout well at about 65 to 75 degrees F (18-24°C). I have not germinated them outside this temperature range. If you use a heat mat, check the soil temperature to
ensure that the roots don't overheat.
Fertilizing - For the first 6 weeks, give a very light dose of liquid fertilizer (about 1/8 strength) once a week. Hydroponic fertilizer is ideal for young seedlings, since it is easily absorbed and complete. After 6 weeks, you may switch to a granular fertilizer if you wish.
It's normal for older leaves to occasionally turn yellow and drop, but if it seems excessive, check that the soil isn't too dry down in the root zone. If it's moist, the plant may need more fertilizer.
Transplanting -- When your plants are 2 months old, you may gently transfer them to a larger pot. Water the soil first, and
avoid letting the soil ball break apart. After transplanting, avoid packing the soil down, and do not fertilize or give sun the first week.
Strange Wonderful Things