3 inch pots

[Colin Miles]

Which of the polypots correspond with what is nominally called 3" pots? Polypots offer 2.5 by 3" which .5ltr and 3 x 3.5" which is 1ltr. Quite a difference in size capacity.

[oldherbaceous]

Good evening Colin, five inch pots are normally 1 litre, so i would have thought the 3x3.5'' pot would have been a .5ltr.
Hope this has not confused things even more

[Colin Miles]

Well - slightly confusing. I think/hope the difference in capacity is down to the shape of the pots which is rather different from normal rigid plastic pots - they are square rather than tapered and the nominally smaller size would therefore hold a greater capacity. I suppose I ought to do the arithmetic on that basis!

[Johnboy]

Hi Colin,
I am not trying to be confusing but a 7cm square pot holds as much compost as a 9cm round pot. This of course is due totally because of the shape.
A 10cm Sq pot 10cm deep gives you exactly 1 Litre.
There are different combinations of the 9cm sq pot
they are all 9x9 but vary in their depth but none of them hold a Litre but certainly more than half a Litre but nearer three quarters of a Litre.
JB.

[Allan]

The point I like about 7x7 is that 15 fit exactly in a standard seed tray. With no wasted space there is minimal growth in the spaces below which in our case has capillary matting.
I make sure they have flat bootoms to make capillary watering via the bench system effective witout inserting wicks.
Allan

[oldherbaceous]

Well i've just checked and i can only get 1 ltr of compost in a 13x11.5 cm pot, and less than .5 ltr in a 3inch x 3.5 inch.
Maybe we have all got different size measures.
We never had this problem when we just had imperial.

[Colin Miles]

Now I am confused. And look at my other moan!

[Colin Miles]

Of course, not only am I confused I also managed to misread or misremember the blurb. I should have said the smaller, 2 x 3.5 inch polypots hold .25 ltr and the larger 3 x 3.5 inch ones hold .5 ltr.