Karen, I would offer 25 of everything and you should be fine. Although, I order geranium seeds from Plant world seeds that only come with 8 or 10 seeds to a packet so I offer 1/2 a packet...It really does depend on what it is and how much you have to share. If I got 1000 poppy seeds, I just dump 100 or so in a packet, no counting out tiny seeds for me. If I get poppy seeds and there were 200, I would offer up probably 5 packets labeled as 25+. I'm not a veg. grower but I do buy veg. seeds if they strike my fancy for sharing. I usually do 1/2 a pack with those.
That wasn't much help, was it?
Thank you guys for the compliments about my Angela, she is just as feisty as she is beautiful...The wedding was wonderful. I'm sure I'll be posting more pics when the professional ones arrive.