Transplanting -- Move it to a pot about 1 gallon in size, which will hold it for a few months. You can then move it to its permanent home - about 5-10 gallons, or into the ground in suitable areas.
For soil, use a well draining mix. I use a mix of 1 part coir fiber to 1 part perlite (use fine- or medium-grade perlite, not coarse-grade). An alternate mix is 2 parts quality potting soil to 1 part perlite. Don't add lime to the mix.
Repot gently to avoid damaging the roots. Watering before transplanting will help keep the soil ball from breaking apart, which may damage the roots.
Most Bomareas prefer mild temperatures and cooler nights. It's possible that this one will not perform well if temperatures consistently get above 85 degrees F (30 C), especially if nights are warm (65°F / 18°C). The foliage may be killed by frost, but the tubers should be hardy to at least 25 degrees F (-4 C). Still, i recommend protecting the plant from freezing temperatures.
Light -- Bomarea likes about a half a day of sun. It can take more sun in cool, coastal areas. It should be given some protection from strong afternoon sun, especially in warmer areas.
Watering -- Bomarea likes the soil kept evenly moist.. but don't keep it constantly saturated either. If your tap water is "hard" or high in minerals, i recommend using bottled water or rain water.
Fertilizing -- During periods of active growth, feed every 2-3 months with a general-purpose fertilizer that contains micronutrients (I use this).
It's normal for an older shoot to occasionally turn yellow and die throughout the year, but if it seems excessive, it could be from not enough fertilizer (nitrogen) or under-watering.
Up and away -- Bomarea likes to climb, so give it something to twine itself around, like a trellis, fence, or another plant. It should ideally be under 1 inch thick (3 cm), so the shoots can twine around it. A 6 foot (2 meter) trellis should work, although a taller one is better if possible. If the shoots grow too long, wrap them down and around your trellis. Don't trim the shoots, since the flowers appear from the growing tips.
The tubers should not be dug up, as this may damage the plant.
Pests to watch for -- Snails and slugs can be a problem in prone areas. Keep an eye out for other bugs too.
Feel free to contact me if you have any questions.
Good luck with it!
Strange Wonderful Things