The Garden Community for Garden Lovers

why does fruit need the sun to make it sweet

United Kingdom Gb

the children need to know why the various fruits we are growing are bitter at the moment, it is because we have not had much sun



Fruit needs sun to ripen and when under ripe will taste bitter or sour

30 Jul, 2009


There's some chemical reaction occurring in the plant and fruit in sunlight which increases the sugars present in the fruit - I used to know exactly what was going on, but its a long time since I did my training and this isn't something you need to remember in detail. Well, that's my excuse anyway...

30 Jul, 2009


the sun's heat speeds up the chemical reactions that change the large sugar molecules into small sugar molecules. basically large sugars are non sweet and small sugar molecules like glucose and fructose [the commonest sugar in fruit] are sweet. thats why growing some plants in the greenhouse speeds up ripenig and maturity.

The bitter taste is another group of chemicals that deter birds and other animals [us] from picking the immature seed and eating them before they are ready.

hope that helps :o)

30 Jul, 2009


Welcome to GOY,
The fruit you are growing will not have reached it's mature stage. Many apples are picked before they are fully ripe and ripen in store. As Moongrower says you need sun to get the best results. Bamboo is like me, chemical reaction is very complex and will vary according to the fertilisers/manure used. In the growth of the plants or trees, get the balance wrong and your fruit will be tainted or will never ripen properly.

30 Jul, 2009

How do I say thanks?

Answer question

Related photos

  • Fruit Trees..
  • Calamondin orange
  • Blossom close~up Nectarine............
  • Ornamental Japanese Apricot, Prunus mume,'Beni-Chidori' (flight of the red Plovers) (Prunus mume 'Beni-Chidori')

Related blogs

Related products


Related questions

Not found an answer?