Does anyone have any advice?

I live in a townhouse/condo. The HOA recently planted bushes in front of my building... I had no say in this, and didn't want them there. But, I accept that I don't get to control everything (since it's a condo), and that the bushes are there. I don't like them, but I accept them and have moved on.

However... someone from the HOA has contacted me and one other person in our building (small building, 6 units, the entire complex has several buildings). She wants us to volunteer to water the new plants. I don't know what's involved, but the last time they sent something out about this, I thought it involved standing around water each plant for quite awhile... i.e. this isn't a matter of just splash some water and call it good, you've got to actually make sure to water the plants for a particular amount of time.

I'm 1000% not interested. I have too many of my own things to do, and not enough time to deal with them. I'm depressed, I'm struggling with my job, I'm trying to lose weight, eat better, possibly get back to therapy, deal with a crazy family, emotional support a brother who's homeless/in jail most of the time, etc.

I'm also a bit upset. They've raised our fees nearly every year for the past several years, and I think the plants are a waste of money. I'm now paying $300/month in condo fees ... and for that amount, no, I don't think I should also have to water the plants.

My problem is... the HOA person is the most helpful person in our community. Whenever there's a problem, she is THE person to go to. So, I don't want to piss her off or get on her bad side.

How do I go about declining the plant-watering, without upsetting this person?

Is it enough to say, "I'm so sorry, but unfortunately, I'm not able to take this on right now." ? I'm afraid it might read as a bit cold.

What about, "I'm so sorry, I'd love to help. Unfortunately, I have a bit more than I can handle at the moment with my job and family. I just don't think I can commit to keeping up with the plants as well." ???

Ugh. I hate stupid stuff like this. What's the point of them charging me $300/month, if they're going to turn around and ask me to do yard work for plants that I didn't want in the first place, you know?

Any advice? Thanks!