You are an agriculture and email marketing expert. Write a detailed, 2400-word guide on email for lavender farms. The guide must cover: 1) Building an email list (visitors, online), 2) Welcome sequences for new subscribers, 3) Seasonal bloom and harvest emails, 4) Event and workshop announcements, 5) Product and gift ideas, 6) Customer appreciation and loyalty, 7) Referral and friend campaigns, 8) Re-engagement for past visitors, 9) Metrics for farms (sales, attendance), 10) Visual storytelling.