Yes, if you are in USA you can order using a Zelle account, as long as it is enrolled using bank transfer details (i.e. not credit/debit card).
Details will be provided at checkout.
NB: Your payment will automatically be allocated to the order number sent in the reason field. Please ensure you send the correct amount (any underpayment will delay your order being processed), and only enter a single order number in this field. If you wish to pay for more than one order you will need to make a transaction for each. The email address you use must be the same as the email used on your Seedsman account.