“Give a consistent and ample amount of water,” says Sullivan. “’Consistent’ means you’re doing it on a regular basis and ‘ample’ means enough, which varies from plant to plant. Make sure the water penetrates the soil as opposed to just putting a little bit on the surface.” Newer plants will need to be watered more frequently because their root systems aren’t completely developed. As for the best time of day, Lambton suggests early morning before it gets too warm so the plant can really soak up the water. If you water in the evening, your plants might be more prone to fungus and other diseases