This pattern came to me a 2 years ago.  I didn't share it because I was trying to be too precise.  This is a loosey goosey style of pattern because once you finish the first row it can be different each time you make it.  I have shared pictures of 2 of the trees I've made.  I'm pretty sure you can make the tree as big as you want.  
Warning: this can be fiddly.
Never Ending Christmas Tree Vicki Clarke 2017
Materials
Crochet hook with small tip
Green Thread (I used size 20 Lizbeth #687 in sample)
Shuttle or needle
Terms:
SR- small ring
LR- large ring
lj-  lock join
bp- add bead to picot 
a- first half of the ds
b- 2nd half of the ds
vsp- very small picot
String lots of beads on thread and then fill shuttle.  Cut from ball.
The bulk of this pattern is based of the basic Ankars motif
of:  
*SR     5 – 5
LR 
       5+ (prev ring) 5 – 5 – 5*        
Note: I added 2 beads to the 2nd
picot of the large ring then joined the next rows between the beads.  I don’t think these show up so did not
include this as part of the pattern.
Start with the tip of the tree:
FR 1    1 vsp  2a  4 2b
p 8
*SR     5 – 5
LR       5+ (prev ring)
5 – 5 – 5*
Make * to * 4 times for wide tree
Make * to * 2 times for narrow tree
R         5 – 5
FR       8 +(p of 1st
FR) 1 2a 4 2b 
Pull up as many beads needed to reach the 2nd
picot on the 1st large ring, join to the 1st large ring
(this bridges you to the next row)
LR         5+ (prev
ring) 5 – 5 – 5
Join to the picot of the next large ring in the previous
row*
So you will repeat the combo of [SR, LR join] until you have
joined to all the 2nd picots of the large ring on the row. 
Finish with a small ring then pull up as many beads on the
thread that you need to reach the 2nd picot of the first Large ring
of the next row.
I have included pics of the back side of the wide and narrow
trees so you can get an idea of how many repeats I did. 
I did not always join between sets of SR, LR and the wider
the tree gets the more likely you will have a few repeats before joining to the
previous row.
This is a loosey goosey pattern that can go on forever….
|  | 
| Front of trees. | 
|  | 
| Back of trees so you can see how many big rings I used for each row. | 
 

