If fertilizer was not included in your original mixture, two weeks after planting fertilize following the instructions onthe package. The best ever yams we saw were grown in a neighbour’s garden in Dunedin which is an indication that they are quite happy with cooler temperatures, though frost kills off the foliage. Fri., Oct. 21, 2016 timer 3 min. How to Propagate Sweet Potato Slips You can purchase slips online or from someone who grows yams, but it is a simple process to produce your own slips. Snip off one-quarter of the vines at their base using clean, sharp pruning shears. Pots spilling with sweet potato vines are particularly attractive. Yams can handle more shade than potatoes. By doing this, the system allows the sweet potato to grow as it would in its natural environment, along hillsides. So, when last summer I decided to leave a single leftover sweet potato that I was using to create slips for field planting in the starting tote, I knew I was going against the grain. However, sweet potatoes are very distinct from yams. If you want to grow your sweet potato vines as decorative plants, find a small three- or four-inch seedling pot with good drainage. Itâs easy to grow a sweet potato vine indoors in the same way you would grow an Irish potato in water, Place toothpicks into the sides of the sweet potato, put in a container of water and place in a sunny window. As long as you keep the soil damp and warm, the yam slips will liven up very rapidly. Tubers can come in a host of colours, but our T&M Ocais a predominantly rose or red skinned with a crâ¦ Some of the stems which rest on the soil will readily root and the plant can grow to a sizeable bush. Growing Yams in Containers. Place the entire yam in a planting flat and potting soil until it reaches halfway up the root. The structure was designed to mimic the spiral pattern that a sweet potato grows along its central stem or vine. Then, keep the yam in a warm, moist area until slips begin to form. Growing Beauregard Sweet Potatoes. Use a container mix amended with compost, sand and a fertilizer high in potash is ideal. Sweet potatoes prefer to grow in soil that is high in potassium. Buy seeds of yams just like buying potato seeds from a garden centre. As the stems grow upward, continue to add more of you soil mix until the level reaches the top of the container. Store the tubers in a cool, dark place. Avoid garden soil, which is too heavy and becomes compacted. Position a half-barrel planter or other large planting container in a sunny location. Push three toothpicks in a yam about halfway down and place in a glass of water. Earthing up will help increase production. Forest lands in most tropical region offers ideal environment for growing yam both in soil quality and climate conditions. You canât harvest tubers in this manner, however. Make 42 inch â¦ in diameter from the last year’s harvest. 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