Pale/yellow leaves??

[Stiney]

Hi everyone, nice site, I was just wondering if anyone could help me with this.
My plant has for about 3 weeks now been losing its oldest leaves, the ones at the bottom, they have started to one by one turn pale green, then yellow and eventually to dry up and fall off. The newer leaves are all perfectly healthy. Is this natural, is it just a part of the plants normal growth? or if thier something wrong? Thanks a million, Stiney

[meangreen]

Lacking in N which is a mobile element and the plant is taking it from the lower leaves to satisfy the needs of the new growth.Give it some nitrogen,it begging you.

[boarman]

three week old plant leaves are yellowish then go brown and die. nitrogen deficiency? if so will feeding cure it

[meangreen]

Yes,will do nothing for the leaves that have completely yellowed.

[boarman]

gave plants a good feed and almost cured the yellow leaves, only yellow at the tips. how do i finish the job?