House Plant Care - Oxalis
Purple or green Oxalis triangularis are common resemblances to the shamrock or clover. They are also sometimes called 'false shamrock." They have three leaves in one stem which acts as an umbrella, shuts down in night and blooms up in the morning for the sunlight. The leaves are aware when to open by remembering the length of time spent in darkness. If there is any kind of interruption created by focusing them to the bright artificial light, they open very slowly after the light and it slows its natural blooming process. In the next morning of natural light, it awakes in the mid day of heavy sunlight, as it has experienced the artificial light in the odd time earlier day.
Sustaining the plant
All the leaves of the plant dries away and you will be left with the pot of soil if you're getting daytime highs of just 100 foot-candles. Despite this total dieback of foliage, the bulbs are probably still alive. Make sure you are not left the soil compacted, aerate it in the frequent intervals. In a few weeks, you should notice new stems emerging. There shall be two or three bulbs growing, as the plant cannot produce the same like nursery conditions in an indoor environment.
To Do: For growth
If you can get up to 600 foot-candles, new offsets of stems grow from the diebacks. If your oxalis is getting some direct sun, the soil may reach complete dryness within the same day. Cautiously, water the soil before drying it out. Dead stems can be easily removed by hand once they are completely dried. You can use fertilisers whenever you see new stems come alive.
More about Oxalis
Oxalis bulbs can keep producing new stems after dying back, don’t worry then you find a plain soil in the pot. It's best to repot once the stems die back or when most of them are on their way to dying off as Oxalis grow back from the bulbs. A regular potting mix of peat with some perlite will do better for the new growth. Leaves will remain slightly closed even during the day as the soil dries. Compare a thirsty oxalis to a well-hydrated plant. This is a sign that your plant requires a good soaking immediately.