Your seeds should be planted immediately for best germination
Getting started - Soak the seeds overnight in a cup of water.
Cold treatment. Your seeds should be given a 6 week cold treatment in the refrigerator for best germination. This tricks them into thinking winter has passed, so they germinate better. The instructions below explain the process.
Prepare a soil mix of about 2 parts sterilized potting soil and 1 part perlite. An alternate mix is equal parts of coir fiber and perlite. Fill a small, plastic ziplock baggie about halfway with the soil mix, place the seeds on top, and cover them with an inch (2.5 cm) of soil. Water the soil just until evenly moist (not soggy), and zip up the baggie.
Instead of a baggie, you may use a small plastic Tupperware-type container. You will be digging the seeds out later, so don't use a big container or the seeds will be hard to find.
Place them into a refrigerator that stays above 37º F (2ºC). Inside the door is usually the warmest part of a refrigerator. Mark your calendar to remove them after 6 weeks. Then remove the seeds and plant them as described below.
After cold-treatment -- Use pots about 3-4 inches tall (8-10 cm) and 3 inches wide, with drainage holes. Use the soil mix mentioned above. You may add some slow-release (pelleted or organic) fertilizer, but don't add lime to the mix, because they prefer slightly acid soil. Place 1 seed in each pot, cover with 1/4 inch (6 mm) of the mix, and water the soil until evenly moist, but not soggy. If your tap water is very high in minerals ("hard water") use bottled water or rain water.
Until the seeds sprout, keep the pots between 60-74 degrees F (15-23°C) during the day, and a bit cooler at night (50 to 70°F / 10-21°C). Avoid letting them get above 77 degrees F (25°C). I recommend using a minimum/maximum thermometer. Give them some air circulation. They can begin sprouting between 6 and 10 weeks, and continue for another 2-4 months.
Once they sprout, give them bright light, but shade them from strong sun exposure. Water them enough to keep the soil surface from drying out (but don't keep the soil soggy either). Avoid transplanting them the first year.
Lighting -- Lapageria prefers part sun, with protection from hot afternoon sun. Lapageria likes its roots cool, so try to keep the pot shaded in warmer conditions.
Climate -- Lapageria prefers mild daytime temperatures and cooler nights. It's happiest between about 40 and 85 degrees (5-29°C) with cooler nights Adult plants are said to tolerate down to the low 20s (-5°C) if given overhead protection. But protect your seedlings from frost the first 3-4 years. You may grow them indoors or in a greenhouse provided that the air is cool and over about 40-45% humidity with good air circulation. If the humidity becomes low, consider using an ultrasonic room humidifier, which are sold at home improvement stores and thrift shops.
Watering -- Lapageria likes moist soil, but it shouldn't be constantly soggy either. Don't allow the soil to dry out, and don't let the pot sit in a tray of water. Also avoid keeping the leaves wet for prolonged periods, as this may cause leaf fungus in some areas.
Support -- Adult plants prefer to twist around a trellis, fence, wires, etc. Your seedlings will not need a trellis for at least 2 years, since they are slow growing when young.
Fertilizing -- Seedlings grow slowly the first 2 years and do not need much fertilizer during this time, so be careful not to overfeed them. The first 3 months, feed every 2 weeks with liquid fertilizer at 1/8 the normal dose (hydroponic fertilizer works well for this, because it is easily absorbed and complete). Then feed about every 3-4 months with a slow-release (pelleted or organic) fertilizer that contains micronutrients. When growth speeds up after about 2 years, increase the feeding to every 2-3 months.
Potting up - When your seedlings are 12-18 months old, they may be gently transplanted to 2-quart (2 liter) pots, which can hold them for another 1-2 years. They may then be transferred to 5 gallon (19 liter) containers, which can be their permanent home.
Pests to watch for -- Protect from snails and slugs, which love Lapageria. Watch for aphids on the new growth, and spider mites under the older leaves (tiny "dots" on the leaves). Scale (small discs) and mealy bugs may appear on the stems or leaves.
If you have any questions, please email me.
Have fun growing them!
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