How to identify when bud burst, green up, and green down started. https://www.globe.gov/c/message_boards/find_thread?p_l_id=358145&threadId=3141760 2026-08-19T05:43:12Z 2026-08-19T05:43:12Z Martha Robus Kopplin https://www.globe.gov/c/message_boards/find_message?p_l_id=358145&messageId=3141876 2012-10-02T17:08:13Z 2012-10-02T17:08:13Z

For Green Up, your study site is one branch and the last four buds on that branch. You number them 1 to 4, starting at the ending or terminal bud and then counting down from that bud to the next 3 buds. Whenever you go to your site to collect data, you look at each bud and determine what state of budburst/ green up it is in: dormant, swelling, budburst, or a measurement of growth in mm. So for Green Up, you don't have one date for it happening, like you do with Budburst. Green Up occurs over a period of time and you document the stages of Green Up over several or many days by following the growth of leaves, one from each bud. If at all possible, you would want to follow the growth of each of the four leaves from their dormant stage, before any growth happens, through swelling, budburst and then as they lengthen until they no longer increase in size - that is they have become their final, mature size. Please let me know if you need any further clarification.

Martha Robus Kopplin 2012-10-02T17:08:13Z Martha Robus Kopplin https://www.globe.gov/c/message_boards/find_message?p_l_id=358145&messageId=3141930 2012-10-02T16:57:42Z 2012-10-02T16:57:42Z

Hi Maria - This can get confusing so I am glad you asked. Budburst has officially occurred when you can see buds bursting on at least three different branches of a tree AND this has to occur on at least 2 trees of the same species, the ones you have identified in your Budburst study site. So, it is 3 branches on each of 2 trees. You would record this date as the date of Budburst. I hope I have explained this clearly - please let me know if you need more help.

Martha Robus Kopplin 2012-10-02T16:57:42Z Maria Lorraine de Ruiz-Alma https://www.globe.gov/c/message_boards/find_message?p_l_id=358145&messageId=3141759 2012-10-02T14:31:43Z 2012-10-02T14:31:43Z

I always get confused when these processes start, how do we know when the bud burst started, on one branch, 2, or 3? The same with the green up, in one branch? More than one branch? 3 parts of the same branch? 3 different branches?

Maria Lorraine de Ruiz-Alma 2012-10-02T14:31:43Z