Although jasmine (Jasminum spp.) makes a fragrant addition to your houseplant collection, it also grows well outdoors .These plants can’t stand soggy soil, so water only when the plant needs it; the timing varies based on the season and temperature.Jasmine tends to be susceptible to root rot fungal infection, which often appears when the roots stay too wet. In general, jasmine prefers moist but well-drained soil. If you water it too often, the soil can’t drain effectively and the roots sit in water. In addition to causing root rot, this can stunt the growth of the plant or keep it from flowering. Not enough water can be just as dangerous, although jasmine tends to handle underwatering slightly better than overwatering.In the heat of the summer, you might need to water your jasmine every two to three days, or whenever the top 1/2 inch of soil feels dry. Feeling the soil is the best indicator; some soils retain water better than others, so you typically need to water less often with these. If you’re having a rainy summer, you might need to supplement only occasionally. Jasmine needs at least six hours of sunlight per day to flower properly, but plants that get direct sun all day might require more water. With all these variables, there’s no set schedule for watering your jasmine. Just poke your finger in the soil at the base of the plant every couple of days to see if it feels dry 1/2 inch below the surface. If so, it’s time to water.Jasmine plants rest during the colder months and resume growth in the spring. Without the need to support blooming, they don’t require as much water in the winter. The moisture doesn’t evaporate out of the soil as quickly, either. This means you don’t need to water nearly as often in rainy or wet winters, you might not need to water outdoor jasmine at all. Check the soil about once a week to see if it feels dry 1/2 inch below the surface, which indicates the plant needs some water.Because your soil can help or harm your plant, check how well it drains to see if you can improve the environment around your jasmine. Water the ground, and then grab a handful of soil and squeeze it. If it forms a ball that holds its shape but breaks apart when you touch it, you have the right consistency. If water squeezes out and the soil forms a hard ball, your soil is too dense; if it won’t hold a shape at all, the soil is too loose. Jasmine likes soil that drains well, so the biggest concern is dense soil such as clay. Turning compost into the top 6 inches of soil can help it drain better, as can adding amendments such as sand or perlite. It’s best to add these before you plant your jasmine, but if you’re mixing it into the soil afterward, dig carefully to avoid damaging any roots.