Initially, experiments focused on cultivating green leafy vegetables, such as cabbage. NASA uses LED lighting to grow a variety of plants on the International Space Station. Space Requirements. Common Core Current studies involve growing flowering plants … In the context of human spaceflight, they can be consumed as food and/or provide a refreshing atmosphere. Temperature. Answer. 2010-07-18 22:50:42 2010-07-18 22:50:42. Wiki User Answered . The growth of plants in outer space has elicited much scientific interest. When I first started, I had very little idea about how plants grow and why they need different amounts of space. : light, air, water, nutrients, and space to grow. When plants are just seedlings or cuttings they can be grown in close proximity, but as they grow their need for space will increase and they will need to be moved or thinned out. Astronaut farmers need to ensure that the plants grown in such artificial conditions are safe to consume, don’t have any side effects, provide more of an energy boost in relatively small quantities, and are pleasant to eat…. • Sun and water serve a vital role in the growth process. In farms and gardens, this is achieved by removing the smaller or weaker plants thus making space for the stronger and more aggressive plants to grow. Small spaces cause the roots of the plant to crowd, inhibiting growth. 61 62 63. My first year I planted way too many veggies in too small of a space and ended up with very low yields. Humanity may be a long way from harvesting tomatoes in outer space, but researchers now have a better idea of how plants might grow in such zero gravity conditions. The act of growing a plant in space is just one part of a more complex, bigger and wider concern. Plants require space to grow. Plants like corn and apple trees that require a certain number of neighbors to pollinate really do need those neighbors, so make sure that you don't end up with too few plants. Top Answer. Asked by Wiki User. Most plants require a certain temperature to grow. Why do plant need space to grow? • Plants need specific things to grow. at least a little. The Results of using LED Grow Lights in Space. Some plants grow bigger than others so it requires more space to get the light right. I have found that all you have to do with wildflowers is sow the seed so it almost covers the ground. The space a particular plant requires to grow is relative to the size of the plant's root system and how big the plant will grow above ground. One factor affecting marijuana plant spacing is the differing ways reflectors, hoods, and various types of hydroponics bulbs affects the amount of square feet that have enough light intensity for your plants. 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