How to Grow Oxalis. You will find it is simple to grow and maintain your Oxalis if you use the right proportions of sunlight and water. Regularly water your Oxalis plant so that the first 2 inches (5.1 cm) of surface soil is moist. Water the soil well, ensuring it drains well. Growth. Fertilize your Oxalis lightly with a diluted liquid fertilizer once … Oxalis ‘Iron Cross’ is just another member of the oxalis family. HOW TO GROW OXALIS TRIANGULARIS FROM CORMS. Swabbing the infestation with 70% isopropyl alcohol diluted in water is proven effective when done regularly until the pests have disappeared. Water the plant every 2-3 days. However, it’s important not to overwater the plants or leave them in standing water. The act of propagating an Oxalis plant is one of the easiest steps for the Purple Shamrock. It tends to grow at a medium rate. There are a few ways in which you can go about propagating your Oxalis, This is typically conquered through separation. The trick is just to keep the seeds a bit moist and warm. I usually put them in with either the very tip sticking out of the dirt or just underneath the dirt (either way has worked for me). To grow your Oxalis indoors, place up to 5 bulbs in an 8-10 inch pot to create a houseplant. Oxalis, or shamrock plant, is an easy-to-grow houseplant valued for its delicate, clover-shaped leaves. If you don’t obtain an actual plant, you can simply order corms and pot them up to grow your own plants. Water lightly, ½ to 1 cup will usually do the trick until top growth emerges. Caring for Your Oxalis Triangularis. Fertilizer: Oxalis are not heavy feeders. Water lightly during active growth about once per week when the top half of the soil feels dry. Gently spread the seeds in the pot, and place on a warm place were it does not get direct sun. Oxalis seeds can be bought trough the net, and are not difficult to germinate, that is if they are not to old. The seeds should be sown using fresh seed; these are normally produced at the end of summer. To grow oxalis in outdoor beds, first, you need to find a location where the soil drains well as the oxalis bulbs cannot survive in soggy soil or standing water. Although shamrock plants are usually bright green, oxalis is also available in shades of maroon and deep purple. Be sure to keep excess water out of any tray underneath pot. Keep moist, during the spring and summer repeating twice a week all summer long. It is very simple to propagate an Oxalis: simply dig up a few of the roots (they look like little pine cones), and replant them upright in a new pot. Sometimes infestations can grow out of hand rendering the plant wilted and dry. Growing Oxalis Houseplant. Oxalis is native to So False Shamrock, Wood Sorrel, and other Oxalis members can be grown from either roots or seeds.. Water less in winter allowing the soil to dry a little. You can expect to see blooms within 10 weeks. If growing from roots then bury the tubers about 4 to 5 cm (~2 inches) deep in the autumn. Depending on the variety, the blooms may be white, purple, yellow, pink or red. If your Oxalis are outside and you get very little rainfall in your area, you may have to water them every day. Soil should remain lightly moist during times of growth. I actually purchased my own plant in the annuals section of a nursery, so I started out with a plant in a 4 inch pot: Water the pot well before sowing the oxalis seeds, let all access water drain out. Water the plants thoroughly letting the excess water drain through the bottom of the pot. It should grow fine in a good potting mix and one good full watering, after planting the bulbs give it one full watering until the water drains through the pot, then leave it for a week or two in medium sun, if it’s not sprouting its probably not the soil that is the issue. It is very simple, convenient, and easy to do! The typical height for an Oxalis Triangularis plant can range between two and 12 inches tall. A tall, lanky plant is either getting too much heat or not enough light. How to Grow.