Overwatering as well as low iron may cause yellow leaves. Might also be a bit too much sun.

wowie kazowie I have dreamed of growing patchouli, what does it need to be happy? I have no idea if I could get seeds where I live, and no idea if it would grow, what garden conditions does it like? Batya

Prefers average to rich soil with neutral pH and sun or partial shade. Prefers warm, humid conditions. It is very susceptible to cold and can die. Cut back in spring to promote healthy leaf growth.

There are 2 kinds of patchouli. One is Pogostemon cablin, a tender perennial, sometimes treated as an annual, growing to 1.5 metres tall with a bushy habit. The leaves are large, oval and furry. The stems are square. Bears whitish flowers, tinged with purple in both axillary and terminal spikes. The plant does not flower readily. P. heyneanus, also known as Java Patchouli, has smooth stems. It has an aroma inferior to that of P. cablin.

I had a P. cablin for many years until it died last year due to me being too ill to give it an occasional drink for several months (and no rain!). It definitely likes a hot climate.

Yahoo Daisy!! Sounds like a plant for me. Now if I could just find some seeds or a cutting...........I'll scour Israel on the web and phone first, then I'll look farther. But I can dream starting now, can't I? Batya

I bet I'm overwatering the patchouli. The drip irrigation is on for 30 minutes each day...that's what the other garden plants require...but I bet I can cut it back to 30 mins every other day and be okay.

As for the climate...
Since the patchouli has been in the ground, it's seen 50 degree weather for a few weeks straight...then it's also seen 100 degree weather all sumemr long. I feel like it's foolproof. The one thing that has been very consitent is the water. The drip irrigation system is on a timer, so the watering is consistent. Also, our climate is very humid...even in the winter.

Unless your soil and area is very hot and arid, you don't need a daily watering. Maybe every other day would be better. Many plants like to be almost dry at times.