This proverb means that love, like a grenadelle, starts in a youthful phase where it might appear of little value, much like the fruit when it is still green. Over time and with maturation, love becomes deep, true, and precious, just like the grenadelle that turns sweet and delightful when fully ripe. An equivalent proverb in English would be ‘Good things come to those who wait,’ suggesting that patience leads to valuable rewards.