Israel's strict blockade of Gaza, which has been in place for more than two years, prevents all exports and limits imports to a few humanitarian items. Egypt has also kept its one border crossing with Gaza, at Rafah, largely closed.The number of items that Israel allows into Gaza, while not a comprehensive list of everything needed, has included a wide variety of categories, way beyond a "few" items. And, as I noted, Israel has allowed flowers and strawberries to be exported from Gaza, both last spring for the flowers (if I recall correctly) and in the past week for both items.
Notice also that Israel "blockades" while Egypt simply "largely closes" its border. The Guardian could not bother to mention that 99% of all goods that enter Gaza is through the party doing the "blockading."