wrote in message
...
Hello,

I bought a mandarin orange plant and a grapefruit plant in the summer.
Unfortunately when I went away, they were either over watered or under
watered, because when I came back, they dropped their leaves. After a
little dormant period, they have started to shoot again. I looked
closer today and see that they are shooting from the bottom of the
"trunk".

Now I should explain that I am new to all this (if that wasn't obvious
already). Three quarters of the way up the trunk there is a faint
diagonal line, so I am wondering if this is the graft? I have read
some books and they say when repotting citrus, to make sure the graft
is above soil level. Reading that made me think the graft was quite
low, so I'm not sure; these are a foot high. Does the graft rise as
the plant grows?

I know apples for example are grafted. I hadn't realised citrus was.
The thing is, these new shoots are below, what I think may be the
graft. Without waiting months for them to flower and fruit, do you
think that what I am growing is not what I am expecting? What are
citrus grafted onto (and why?).

Almost all citrus sold in here in S. Florida are grafted onto "sour orange"
root stock for hardiness and pest control. The graft may rise slightly as
the tree grows and yes you shouldn't bury it. It sounds like someone
overwatered your plants and may have killed the grafted tree. You are
getting suckers from the root stock that will not produce a fruit that you
will want to eat.

All of this having been said... your best bet for citrus in the long run is
a supermarket. From your e-mail address I will assume you are in the UK
where citrus grown outdoors has to be an impossible task at best. Citrus
trees need positive drainage, minimal water, and good quality citrus
oriented fertilizer. Sure you can grow them indoors if you've got the room
and the time. But citrus trees grown in the ground will eventually produce
far more fruit than you, your family, your neighbors, and your friends can
eat!