Meyer lemons, like other varieties, produce green fruit that changes to yellow! Unlike most other lemons, Meyers take on a golden, dark-yellow shade once ripe. Don't harvest them until they're a shade of yellow similar to an egg yolk. That ripening process can take up to six months. One common complaint from lemon growers: "my Meyer lemons are not turning yellow." Remember that lemons can take up to six months to ripen! If your patience only gets you unripe, lime-colored fruit, think about the location of your lemon tree. Meyer lemons can experience "sunburn" that results in areas of browning on the fruit's surface. Keep in mind that some citrus, including Meyer lemons, require a temperature dip to stimulate that yellowing ripeness. If your weather is consistently warm, your ripe lemons may not turn yellow. If you've experienced a total lack of temperate weather, check for ripeness by squeezing the fruit of the Meyer lemon tree -- it should soften to the touch when ripe.